Birth Weight News and Research

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Babies born small may face lasting differences in school performance

The study highlights that fetal size, not just gestational age, plays a crucial role in long-term neurodevelopmental outcomes for term-born children.

23 Oct 2026

Gaining too much weight during pregnancy raises complication risks

A new study of more than one million births led by McMaster University researchers has found that gaining too much weight during pregnancy, regardless of a person's starting weight, is linked to a higher risk of life-threatening maternal complications.

22 Oct 2026

Antibiotic exposure during childhood linked to higher risk of IBS in young adults

Antibiotic use from childhood through early adulthood was associated with higher odds of irritable bowel syndrome (IBS) at age 24, with the odds increasing as the number of antibiotic prescriptions rose, according to a new study presented today at UEG Week 2026.

19 Oct 2026

Replacement chemical for harmful phthalates may restrict fetal growth

A chemical used to make plastic more flexible, once introduced as a safer substitute for older additives now known to be harmful, may itself also be harmful, slowing babies' growth in the womb, a new study shows.

13 Oct 2026

HPV vaccines protect against cancer. Could they benefit pregnancy?

Findings from a nationwide study suggest HPV vaccination may reduce adverse pregnancy outcomes, emphasizing its importance in reproductive health strategies.

12 Oct 2026

Extreme heat threatens maternal health and newborn wellbeing worldwide

Extreme heat has led to a marked increase in the risks faced by pregnant women and their babies, according to a survey of 1,000 healthcare professionals in countries including Brazil, India and Zimbabwe.

11 Oct 2026

Kangaroo care helps smaller babies. Now researchers are studying babies born at normal weight

Researchers examine whether extending SSC beyond the first hour can improve early weight changes, breastfeeding and other maternal and newborn outcomes in normal-birthweight infants.

27 Sep 2026

Could a parent’s hospital job shape a child’s nasal microbiome?

A pilot study of 37 families found that children with healthcare-worker parents had lower nasal microbial diversity, with the largest differences among children whose two parents worked in healthcare. Porphyromonas was significantly less abundant, while Neisseria showed a similar non-significant pattern, but the cross-sectional study cannot establish causality or determine whether these microbiota differences affect health.

23 Sep 2026

Children of single mothers by choice show favorable birth outcomes

The children of single mothers who conceive through medically assisted reproduction (MAR) have similar outcomes to babies of partnered mothers who had conceived naturally, a UCL-led study has found.

22 Sep 2026

Prenatal cannabis exposure linked to subtle brain and behavioral differences in children

A large ABCD study of 10,838 children found that prenatal cannabis exposure was associated with small differences in resting-state brain connectivity, higher behavioral and emotional problem scores, and lower performance on several cognitive measures in late childhood. PCE-related connectivity patterns partly overlapped with those linked to psychopathology and cognition, although the cross-sectional observational design cannot establish causality or mediation.

22 Sep 2026

The link between PM2.5 and ADHD held up after researchers tested other explanations

Using two decades of U.S. county-level data, researchers found that long-term PM2.5 exposure was robustly associated with higher childhood ADHD prevalence, while associations with low birth weight and diabetes weakened after accounting for county-specific temporal trends. The ADHD association persisted after socioeconomic, demographic, state-level, exposure-period, and spatial adjustments, although the ecological study cannot establish an individual-level causal relationship.

9 Sep 2026

What mothers eat in pregnancy may shape a child’s weight years later

A prospective study of 252 mother-child pairs found that higher combined maternal fruit and vegetable intake during pregnancy was associated with lower odds of overweight or obesity in children at age four. Total and natural fruit juice showed no association, whereas higher commercial fruit juice intake was associated with increased odds, though the authors emphasized that this finding was exploratory.

7 Sep 2026

Bariatric surgery restores menstrual cycles and reduces polycystic ovaries in obese women

Metabolic bariatric surgery improves menstrual cycle frequency and symptoms of polycystic ovaries in women living with obesity, a new study from the University of Surrey reports.

7 Sep 2026

What four pregnancy eating patterns revealed about mothers and newborns

Researchers analyzing 1,404 pregnant women in Germany identified four distinct dietary patterns that differed substantially in maternal BMI, socioeconomic status, age, and gestational weight gain. A vegetable-rich pattern was also associated with selected neonatal measures, including greater birth length, but most newborn associations were modest or nonsignificant, and the observational study cannot establish causality.

6 Sep 2026

ART-conceived children show reassuring long-term health outcomes

The birth of Louise Brown in 1978, the world's first baby conceived through assisted reproductive technology (ART), was a major breakthrough that reshaped the field of reproductive medicine.

4 Sep 2026

Early baby swimming linked to a small IQ advantage by preschool age

A prospective cohort study of 1,935 mother-child pairs examined whether baby swimming during the first 6 months of life was associated with IQ and cognitive performance at ages 4 to 6 years. Swimming participation was associated with modestly higher scores across several cognitive domains, but the researchers cautioned that the observational findings cannot establish causation and may partly reflect socioeconomic and family-level differences.

1 Sep 2026