Maternal smoking during pregnancy in relation to child overweight: follow-up to age 8 years
Aimin Chen1, Michael L Pennell, Mark A Klebanoff
1Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, NC 27709, USA. chen17@niehs.nih.gov
Insights
Maternal smoking during pregnancy is linked to an increased risk of childhood overweight. This association is detectable before age 8, impacting children
Area of Science:
- Pediatric Health
- Public Health
- Reproductive Health
Background:
- Existing research suggests a link between maternal smoking during pregnancy and offspring overweight.
- The magnitude and age of onset for this association remain unclear.
Purpose of the Study:
- To investigate the relationship between maternal smoking during pregnancy and offspring weight, height, and body mass index (BMI).
- To determine the age at which this association becomes detectable.
Main Methods:
- Analysis of prospective data from 34,866 children in the US Collaborative Perinatal Project.
- Examination of maternal pregnancy smoking in relation to offspring anthropometric measurements at ages 1, 3, 4, 7, and 8 years.
Main Results:
- Offspring of smokers exhibited lower birth weight, followed by rapid weight gain.
- Children of smokers showed consistently decreased height and an increased risk of overweight, particularly girls.
- At age 7, the odds of being in the 85th percentile for BMI were higher in children of mothers who smoked heavily during pregnancy.
Conclusions:
- Maternal smoking during pregnancy is associated with a modest increase in the risk of childhood overweight.
- This increased risk is evident before the age of 8 years.
Background:
Data from several studies indicate that children of mothers who smoked during pregnancy may be at a risk of overweight compared with children of non-smoking mothers. The size of this relation, however, is unclear, as is the age at which it becomes detectable.
Methods:
Prospective data for 34 866 children enrolled in the US Collaborative Perinatal Project were analysed to examine maternal pregnancy smoking in relation to weight, height, and body mass index (BMI) in offspring at ages 1, 3, 4, 7, and 8 years.
Results:
Compared with offspring of non-smokers, children of smokers had (i) weight that was lower at birth but then quickly equalled or exceeded that of non-smokers, (ii) consistently decreased height, and (iii) increased risk of overweight, particularly in girls. For example, at age 7 years, the adjusted odds ratio of BMI>or=85th percentile in boys of mothers who smoked on an average>or=20 cigarettes per day while pregnant was 1.22 (95% confidence interval 1.03-1.46), and in girls it was 1.30 (1.08-1.56).
Conclusions:
In these data, maternal smoking during pregnancy was associated with a modest increase in risk of overweight in children before the age of 8 years.
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