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Tobacco Exposure and Conditional Weight-for-Length Gain by 2 Years of Age
Danielle S Molnar1,2, Diana Rancourt3, Robert Schlauch3
1Department of Child and Youth Studies, Brock University.
Insights
Prenatal tobacco exposure (PTE) is linked to restricted birth growth but accelerated weight gain by age two. Early interventions are crucial for children exposed to tobacco during pregnancy.
Area of Science:
- Pediatrics
- Environmental Health
- Public Health
Background:
- Prenatal exposure to tobacco (PTE) is a significant public health concern.
- Understanding the long-term effects of PTE on child development, particularly obesity risk, is critical.
Purpose of the Study:
- To investigate the dose-response and timing effects of prenatal and postnatal tobacco exposure on obesity risk.
- To assess conditional weight-for-length gain (CWFLG) by two years of age in relation to tobacco exposure.
Main Methods:
- Prospective examination of 117 children with PTE and 57 nonexposed children.
- Repeated assessments of PTE from the first trimester using multiple methods.
- Analysis of CWFLG over the first two years of life, controlling for birthweight.
Main Results:
- Neither PTE nor postnatal exposure status directly predicted CWFLG.
- A significant dose-response association was found with fetal exposure, confirmed by infant meconium analysis.
- PTE was associated with restricted growth at birth but accelerated CWFLG by age two.
Conclusions:
- Prenatal tobacco exposure, particularly with higher doses or confirmed fetal exposure, is linked to increased obesity risk by age two.
- Interventions for obesity risk reduction should be prioritized for children with PTE within the first two years of life.
- Examining dose-response and timing of exposure is vital for understanding PTE's impact on child health outcomes.
Objective:
To prospectively examine dose-response and timing effects of prenatal (PTE) and postnatal tobacco exposure on obesity risk assessed by conditional weight-for-length gain (CWFLG), by 2 years of age. CWFLG over the first 2 years of life was examined for 117 PTE and 57 nonexposed children. Repeated assessments of PTE were conducted beginning in the first trimester of pregnancy, using multiple methods. PTE or postnatal exposure status was not predictive of CWFLG. However, there was a dose-response association and an association with fetal exposure ascertained by infant meconium positive for nicotine and metabolites. PTE is related to restricted growth at birth, yet associated with accelerated CWFLG by 2 years of age, a measure that controls for birthweight differences. Results highlight the importance of examining dose-response and timing of exposure associations, along with the importance of obesity risk-reduction interventions within the first 2 years of life among PTE children.
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