Fatter Women Have Fatter Babies
Author: Imperial College London
Published: 2011/08/20 - Updated: 2026/01/26
Publication Details: Peer-Reviewed, Findings
Category Topic: Pregnancy - Related Publications
Page Content: Synopsis - Introduction - Main - Insights, Updates
Synopsis: This research, published in the peer-reviewed journal Pediatric Research by scientists at Imperial College London, presents findings from magnetic resonance imaging studies of 105 newborns that reveal a direct correlation between maternal body mass index and infant adiposity levels. The study's authority stems from its use of advanced imaging technology and publication in a respected medical journal, making it valuable for expectant mothers, healthcare providers, and families managing weight-related health concerns. Women with disabilities or chronic conditions affecting weight management may find this information particularly relevant when planning pregnancies, as it demonstrates how pre-pregnancy BMI across the entire range - not just in overweight or obese categories - influences fetal development and may set trajectories for children's future metabolic health, including diabetes risk - Disabled World (DW).
Introduction
Maternal BMI Effects on Infant Body Fat and Liver Health
Babies of mothers with a higher pre-pregnancy body mass index (BMI) are fatter and have more fat in their liver, a study published in September's issue of the journal Pediatric Research has found. The researchers from Imperial College London say that the effect of a mother's BMI on her child's development in the womb might put them on a trajectory towards lifelong metabolic health problems.
The research team used magnetic resonance scanning to assess 105 babies born at Chelsea and Westminster Hospital. The babies were scanned while they were asleep to measure the amount of fat in their liver cells, the total amount of fat in their bodies and its distribution. They found that liver cell fat in the babies and total fat, particularly around the abdomen, increased across the entire range of BMI in their mothers.
Main Content
Children of overweight and obese mothers are already known to have a higher risk of being overweight and obese themselves, and of experiencing associated metabolic health problems such as type-2 diabetes. The authors of this new study suggest that the changes they found in babies' bodies might be signs of the first biological changes which, combined with an unhealthy lifestyle, might put babies of overweight mothers on a path to ill health in later life.
Professor Neena Modi, from the Department of Medicine at Imperial College London and a Consultant Neonatologist at Chelsea and Westminster Hospital, who led the study, said:
"This study demonstrates that a woman's BMI, even in the normal range, affects the amount of fat in her baby at birth. Fatter women have fatter babies and there is more fat in the babies livers. If these effects persist through childhood and beyond, they could put the child at risk of lifelong metabolic health problems."
"There is growing evidence that a baby's development before birth has a major impact on their health in later life. This means that the prevention of child obesity needs to begin in the womb."
"Today about half of all women of childbearing age in the UK are overweight or obese. Importantly, the link between maternal BMI and amount of fat in the baby spreads across the entire range of BMI, meaning it's not just an issue for overweight and obese mums. We need to identify what the optimal BMI for the mother is so we can help women ensure that their bodies are in the best possible condition before they get pregnant."
Body mass index is calculated by dividing one's weight in kilograms by the square of their height in meters. The World Health Organization classes a BMI between 18.5 and 25 as normal weight, between 25 and 30 as overweight and over 30 as obese. Of the 105 mothers in the study, five were underweight, 69 were normal weight, 23 were overweight and eight were obese.
The researchers used proton magnetic resonance imaging and spectroscopy to measure total adipose tissue and its distribution and intra-hepatocellular lipid (the amount of fat inside liver cells). In adults, high levels of both correlate strongly with impaired control of blood sugar.
The research was funded by the Medical Research Council and Chelsea and Westminster Hospital NHS Foundation Trust. Journal reference: N. Modi et al. 'The influence of maternal body mass index on infant adiposity and hepatic lipid content.' Pediatric Research, Volume 70 - Issue 3, September 2011.
Insights, Analysis, and Developments
Editorial Note: The implications of this research extend far beyond individual pregnancy outcomes, suggesting that public health initiatives around maternal wellness need to start well before conception. While the findings highlight measurable biological changes in newborns based on maternal BMI, they also underscore the importance of accessible, non-judgmental prenatal care that addresses nutrition and weight management for all women, regardless of baseline health status. As nearly half of women of childbearing age in developed nations now fall into overweight or obese categories, understanding these connections becomes critical for breaking intergenerational cycles of metabolic disease - though it's worth noting that BMI itself remains an imperfect metric that doesn't account for individual variations in body composition, muscle mass, or overall health - Disabled World (DW).Attribution/Source(s): This peer reviewed publication was selected for publishing by the editors of Disabled World (DW) due to its relevance to the disability community. Originally authored by Imperial College London and published on 2011/08/20, this content may have been edited for style, clarity, or brevity.