The research team, led by Zahra Ebrahimi Rigi of Iranshahr University of Medical Sciences with colleagues including Mahlagha Dehghan of Kerman University of Medical Sciences, set out to fill a conspicuous gap. Population scientists have documented Iran’s fertility transition in detail, showing how the country moved from high fertility in the 1980s to sustained below-replacement levels within roughly a generation, but few studies have asked married students directly what childbearing looks like from the inside. That matters because university students sit at the exact intersection of the problem: they are adults of reproductive age, they are the future educated workforce, and they are the people whose delayed family formation drives the demographic statistics that policymakers worry about.

Methodologically, the study is a textbook example of interpretive qualitative research. The team used conventional qualitative content analysis in the tradition described by Graneheim and Lundman, an approach suited to situations where little prior qualitative work exists and the research question is exploratory. Between September 2023 and June 2024, they conducted semi-structured, in-depth interviews lasting 45 to 90 minutes with 14 married students recruited through purposive sampling with maximum variation, meaning participants were deliberately chosen to span a wide range of ages, genders, disciplines, income levels, and living situations. Interviews continued until data saturation was reached at the twelfth interview, the point at which no new codes or conceptual meanings emerged. Two additional interviews were then conducted purely to confirm that the themes were stable, and none appeared. Transcripts were coded independently by two researchers using MAXQDA 2020 software, with disagreements resolved through discussion, and the analysis ultimately distilled 200 initial codes into 17 subcategories, five major categories, and one overarching theme.

The first of those categories was medical. Several participants described hormonal disorders such as polycystic ovary syndrome, a common endocrine condition that can impair ovulation and fertility, and chronic diseases such as hypothyroidism, which research has shown can alter ovarian morphology and disrupt menstrual cycles in ways that mimic polycystic ovary syndrome. One participant with PCOS reported that specialists had advised her against using contraception and recommended having children promptly, yet her husband preferred to wait, a tension that left her anxious about her reproductive window. Others worried about how their medications might affect a pregnancy, or whether a condition could be passed to a future child. The study situates these accounts within a broader evidence base: infertility affects couples through sperm dysfunction in roughly 30 percent of cases, ovulation failure in about 25 percent, and fallopian tube damage in around 20 percent, and a systematic review has found that university students generally show only low to moderate awareness of fertility factors and of age-related fertility decline, with non-medical students knowing least.

The psychological category was, if anything, more pervasive. Students described fear, stress, and a lack of peace of mind, saying they did not feel ready to become parents while under academic pressure. One participant put it plainly: it is best to have a child when you are calm, and he was not considering one while still studying. Others worried about transmitting their own stress to their children, or reported painful disagreements with spouses about the timing and number of children. The researchers frame this through behavioral theory, noting that frameworks such as the Theory of Planned Behavior distinguish between wanting children and intending to have them, which helps explain why students can desire a family yet postpone it indefinitely when perceived constraints loom large. Prior intervention research suggests that providing accurate fertility information can reduce fear and uncertainty, and that campus counseling may support more emotionally informed reproductive decisions.

Sociocultural barriers formed the third category, and they were strikingly concrete. Participants described watching friends struggle to breastfeed and care for newborns during their studies, a vicarious experience that made them apprehensive about repeating it. Some said relatives were unwilling to help with childcare and they did not want to burden others. One woman calculated that because she was both employed and a student, all child-rearing duties would fall on her, and she did not want children for at least six years. Others pointed to parenting knowledge acquired haphazardly from friends and social media rather than from any structured source, and even to customs as specific as the expectation that a mother-in-law must purchase the baby’s clothes. The study links these accounts to wider findings that reproductive autonomy is the strongest predictor of fertility plans for childless women, and that access to childcare and fair domestic arrangements bolsters women’s willingness to have children far more than it affects men’s.

Financial barriers came fourth, and they were framed not as individual failings but as structural conditions. Participants emphasized that financial stability, home ownership, and a reliable income were prerequisites for parenthood. One unemployed participant said bluntly that people who cannot support children should not have them. The researchers interpret this through a rational-choice lens: individuals weigh the costs and benefits of childbearing, and when housing, childcare, and education costs are high while job security is low, the perceived costs of parenthood simply outweigh the benefits. This is consistent with a large empirical literature showing that economic constraints, work characteristics, and financial strain shape fertility expectations and delay childbearing. The implication, the authors argue, is that cash incentives alone cannot counteract the deeper economic architecture that makes parenthood feel unaffordable to young, educated couples.

The fifth category combined recreational, occupational, and temporal pressures. Students described chronic tiredness, the loss of leisure time, and doubts about whether they could adequately care for a child while juggling coursework and jobs. One recounted a friend who had tried to balance being a student and a mother, collapsed into exhaustion without support, had to take a leave of absence, and fell a year behind in her studies, an outcome that frightened observers into postponing their own family plans. Others noted that even travel becomes difficult with children, a small-sounding loss that accumulates into a larger sense that parenthood forecloses the last flexible years of youth. The researchers invoke work-family conflict theory here: when the demands of paid employment and study are incompatible with childcare responsibilities, and when people perceive little control over their schedules, exhaustion and time scarcity push fertility intentions further into the future.

The study’s limitations are acknowledged candidly. Fourteen participants is a small sample, though appropriate for qualitative work whose goal is depth rather than statistical generalization. The geographic concentration in Kerman restricts cross-cultural applicability, self-reported data on sensitive topics such as finances and marital stress may be shaped by social desirability bias, the first participant’s prior familiarity with the researchers may have introduced bias, and only married students were included, leaving out unmarried and cohabiting partners. There was no longitudinal follow-up, so the study cannot show how these challenges evolve over time. Still, the strengths are real: maximum-variation sampling, saturation testing, member checking, an audit trail, and thick description all bolster confidence that the findings faithfully represent the participants’ lived experience.

The practical conclusion is the study’s most policy-relevant contribution. The authors argue that Iran’s pronatalist strategy needs to move beyond financial incentives toward what they call a student-parent-friendly university model: flexible academic regulations such as hybrid learning and extended deadlines, tailored academic advising, counseling units for marital and childbearing concerns, peer support programs, evidence-based parenting and reproductive health education woven into curricula, and on-campus childcare. They also call for awareness campaigns that normalize student parenthood and challenge the gender norms that pile caregiving onto mothers. The deeper message is demographic as much as educational. If a couple wants a child but postpones one because of a rigid exam schedule, an unsupportive landlord, a disapproving mother-in-law, and an untreated thyroid condition, no lump-sum payment will close that gap. The tempest, as these students describe it, is made of many winds, and calming it requires institutions, not just incentives, to change.

Subject of Research: Childbearing barriers among married university students in Iran

Article Title: Qualitative study of childbearing challenges among married Iranian university students

Article References: Ebrahimi Rigi, Z., Behzadi Fard, S., Ghonchehpour, A., & Dehghan, M. (2026). Qualitative study of childbearing challenges among married Iranian university students. Discover Social Science and Health, 6(1), Article 102. https://doi.org/10.1007/s44155-026-00437-z

Image Credits: AI Generated

DOI: 10.1007/s44155-026-00437-z

Keywords: Iran, fertility decline, university students, childbearing, qualitative research, pronatalist policy, reproductive health, work-family conflict, PCOS, childcare, gender norms, higher education

DNA methylation is one of the body’s most important epigenetic regulatory systems. It involves the addition or removal of methyl groups at cytosine-phosphate-guanine (CpG) sites along the DNA strand, frequently in promoter regions, and these chemical tags act like volume knobs for gene expression, dialing genes up or down without altering the underlying genetic code. Methylation patterns shift dramatically during periods of physiological upheaval, and pregnancy is no exception. Previous research has documented methylation changes in maternal blood across gestation, including gains of methylation in genes involved in morphogenesis and losses in genes promoting maternal-infant bonding. Other studies have tied methylation shifts to complications such as gestational diabetes and preeclampsia. But a critical question lingered: do these pregnancy-induced changes simply wash away after delivery, or do they endure as a kind of molecular memory?

The research team, led by Su Chen and Miranda Johs of the University of Nebraska Medical Center alongside collaborators at the University of Memphis, University of Southampton, University of Michigan, Michigan State University, and the David Hide Asthma and Allergy Research Centre, was designed to answer exactly that question, and to fix two persistent gaps in the literature. First, most prior studies of parous women, those who have given birth, lacked nulliparous controls, women who have never given birth, making it impossible to isolate the effect of childbearing itself. Second, only a single small pilot study had ever examined whether methylation changes persist beyond the immediate postpartum period. The new work addressed both problems by comparing methylation profiles of parous and nulliparous women at two timepoints in young adulthood, ages 18 and 26, which correspond to pre-pregnancy and at least six months postpartum for the mothers in the sample.

The discovery cohort came from the Isle of Wight (IOW) birth cohort, a three-generation study established in the United Kingdom between 1989 and 1990 to prospectively follow the natural history of asthma and allergy. Of 750 female participants, 144 had DNA methylation measured at both ages 18 and 26, and 89 of those women had childbearing history validated through medical records. Twenty-eight had given birth at least six months before the age-26 measurement, while 61 had not. The researchers screened 389,355 CpG sites, the overlap between the Illumina HumanMethylation450 and MethylationEPIC platforms, using a training-testing screening method called ttScreening, which repeatedly splits samples into training and test sets to filter out uninformative sites. Linear regression analyses followed, adjusting for six blood cell type proportions, residual methylation at age 18, body mass index change, smoking categories, and socioeconomic status.

The result was striking: 184 CpG sites were significantly differentially methylated between parous and nulliparous women after correction for multiple testing. To guard against a cohort-specific fluke, the team pursued replication in an entirely independent population, the ELEMENT cohort from Mexico City, a multi-generation birth cohort of Hispanic women followed for nearly three decades. In the ELEMENT subsample of 54 women, 105 of the 184 CpGs showed regression coefficients pointing in the same direction as the Isle of Wight findings, and 13 of those were statistically significant. Seven of the replicated sites showed lower methylation in parous women and six showed higher methylation, a pattern consistent across both cohorts despite their differences in ethnicity, geography, and age structure. The 13 replicated CpGs mapped to 16 unique genes.

Among those genes, one stands out with particular force: TM2D3, a gene previously implicated in late-onset Alzheimer’s disease through exome-wide association analysis. In the Isle of Wight data, methylation at cg01537571, a site within a CpG island near the transcription start site of TM2D3, was significantly lower in parous women in both cohorts, and methylation at this site correlated positively with gene expression. When the team examined RNA sequencing data from blood samples at age 26, TM2D3 was the only gene among the 16 that showed significantly lower expression in parous compared with nulliparous women. This convergence is provocative given that increased parity has independently been identified as a risk factor for Alzheimer’s disease, hinting that the methylation change at TM2D3 could be one thread connecting reproductive history to neurodegenerative vulnerability.

Another gene of interest is SEMA3A, which encodes semaphorin 3A, a guidance cue signaling molecule that directs developing neurons during embryogenesis and continues to regulate neuroplasticity in adulthood. SEMA3A showed decreased methylation in parous women and appeared in the study’s gene-disease network linked to neoplasms, mental disorders, and reproductive conditions. The gene plays paradoxical roles in cancer: it promotes tumor progression in hepatocellular carcinoma by enhancing proliferation, migration, and invasion, yet acts as a tumor suppressor in head, neck, and breast cancers, where it boosts antitumoral M1 macrophage proliferation and recruits CD8-positive T cells and natural killer cells to repress tumor growth. The authors speculate that lower methylation near the SEMA3A transcription start site in parous women could conceivably relate to their reduced breast cancer risk, though they caution that whether blood methylation mirrors changes in breast tissue remains unknown.

Beyond these two headline genes, the disease association analysis using the DisGeNET database painted a broader picture. Ten of the 16 genes, including SEMA3A, AKAP13, SLC15A2, DOK2, ADAMTS17, ADARB2, NUP37, PLD5, TPK1, and SLC15A3, were most notably linked with neoplasms, mental disorders, and nervous system diseases such as Parkinson’s disease, schizophrenia, and autism, along with substance use disorders. The breadth surprised even the researchers, who had anticipated connections to reproductive cancers but had not expected substance abuse disorders to surface. Gene expression data confirmed that methylation at cg19086905 (ADAMTS17) and cg13375690 (PDE7A) was negatively associated with expression of those genes, providing functional support for at least some of the methylation signals. Notably, several of the identified genes are expressed in the brain, including TM2D3, SLC15A2, PLD5, ADARB2, and PARPBP, while MAP1LC3C, NUP37, and ADAMTS17 are expressed in breast tissue, tissue-specific patterns that may matter enormously for translating blood-based findings into disease mechanisms.

The study’s design carries genuine strengths. Comparing parous women at pre- and post-pregnancy timepoints against matched nulliparous controls in both discovery and replication cohorts is rare, and the six-month minimum postpartum window avoided the transient methylation fluctuations that may have confounded earlier work sampling just two to four days after delivery. Replication across a 98 percent White UK cohort and an all-Hispanic Mexican cohort supports both internal validity and generalizability. Yet the authors are candid about limitations: the parous groups were small, with 28 women in the Isle of Wight and roughly 20 in the ELEMENT analysis; nulliparous status relied on medical records; the duration required for postpartum methylation to stabilize is unknown; and blood serves only as a proxy for changes in other tissues, with roughly half of the identified genes not routinely expressed in whole blood. Factors that change during pregnancy, such as smoking or income, could not be assessed in nulliparous women at comparable times.

Even with those caveats, the implications are considerable. If the methylation changes observed in blood leukocyte DNA reflect parallel epigenetic remodeling in tissues such as the breast or brain, they could furnish a plausible mechanism for how childbearing reshapes a woman’s disease risk across her lifetime, offering a molecular bridge between reproductive history and outcomes ranging from cancer to Alzheimer’s disease. The researchers emphasize that further studies are needed, particularly cohorts with follow-up into later life, to determine whether these parous-related methylation signatures actually predict health outcomes rather than merely accompanying them. For now, the study adds a compelling piece to a growing body of evidence, from brain imaging traces of childbirth to parity-linked dementia risk, that motherhood writes itself into the body in ways science is only beginning to read, one methyl group at a time.

Subject of Research: Persistent effects of childbearing on blood DNA methylation in women

Article Title: Assessing the effect of childbearing on blood DNA methylation through comparison of parous and nulliparous females

Article References: Chen, S., Johs, M., Karmaus, W., Holloway, J. W., Kheirkhah Rahimabad, P., Goodrich, J. M., Peterson, K. E., Dolinoy, D. C., Arshad, S. H., & Ewart, S. (2024). Assessing the effect of childbearing on blood DNA methylation through comparison of parous and nulliparous females. Epigenetics Communications, 4(1), Article 2. https://doi.org/10.1186/s43682-024-00025-9

Image Credits: AI Generated

DOI: 10.1186/s43682-024-00025-9

Keywords: DNA methylation, pregnancy, childbearing, epigenetics, parous, nulliparous, CpG sites, TM2D3, SEMA3A, Alzheimer's disease, breast cancer, Isle of Wight cohort