What Drives Association Between Birthweight, Mid-Childhood BMI? - Summary - MDSpire

What Drives Association Between Birthweight, Mid-Childhood BMI?

Mendelian randomization analyses linked higher birthweight with greater mid-childhood height but the connection could reflect genetic factors related to skeletal growth.

  • By

  • Andrea Surnit

  • May 26, 2026

  • 3 min

Share

Objective:

To evaluate the associations between pregnancy-related conditions, birth phenotypes, and growth outcomes in mid-childhood, focusing on the roles of genetic factors.

Key Findings:
  • A 1-unit increase in birthweight was associated with a 0.45-unit increase in mid-childhood height, equating to approximately 2.3 cm at age 8.
  • The relationship between birthweight and mid-childhood BMI was predominantly driven by genetic pleiotropy, not direct intrauterine effects.
  • No strong evidence was found linking gestational hypertension or preeclampsia to mid-childhood BMI or height.
Interpretation:

The study suggests that intrauterine exposures related to gestational diabetes, hypertension, preeclampsia, birthweight, gestational duration, and placental weight are unlikely to be key drivers of mid-childhood BMI or height.

Limitations:
  • Genetic instruments explained only a modest proportion of exposure variability, potentially reducing power to detect small effects.
  • Outcomes were limited to mid-childhood anthropometric measurements, which may not apply to earlier childhood or adolescence.
  • The study population was exclusively of European ancestry, limiting generalizability.
Conclusion:

The findings indicate that genetic factors play a significant role in the association between birthweight and mid-childhood height, while the relationship with BMI is influenced by genetic pleiotropy.

Original Source(s)

What Drives Association Between Birthweight, Mid-Childhood BMI?

  • by Andrea Surnit

  • May 26, 2026

Related Content

Could Genomics Improve Endometriosis Diagnosis?

Integrated multi-omics study explores pathways tied to inflammation, hormones, and pain

  • May 25, 2026

  • 2 min
IPS Could Minimize GI Effects in Treating Iron Deficiency

Review summarizes pharmacokinetic and clinical data on iron protein succinylate across patients with iron deficiency and iron deficiency anemia.

X Chromosome Loss Tied to Infertility

Women with higher LOX levels had more than double the odds of failing to conceive naturally.