PCBs, DDE, and child development at 18 and 24 months

Area of Science:

• Environmental Health
• Developmental Pediatrics
• Toxicology

Background:

• Background exposure to environmental pollutants like polychlorinated biphenyls (PCBs) and dichlorodiphenyldichloroethene (DDE) is common.
• Understanding the impact of these exposures on early child development is crucial for public health.

Purpose of the Study:

• To investigate the effects of perinatal exposure to background levels of PCBs and DDE on child development up to two years of age.
• To assess the impact of exposure routes, including transplacental and breast milk pathways.

Main Methods:

• A cohort of children was followed to age two years.
• Bayley Scales of Infant Development were administered at 18 and 24 months.
• Transplacental and cumulative breast milk exposures to PCBs and DDE were estimated via sample analysis.

Main Results:

• Children in the highest percentile of transplacental PCB exposure showed significantly lower psychomotor scores at 24 months (4-9 points).
• No consistent effects were observed from PCB exposure via breast milk or from DDE exposure.
• The motor maturation delay linked to transplacental PCBs was evident at 24 months.

Conclusions:

• Transplacental exposure to PCBs is associated with a slight delay in motor maturation in children, persisting to 24 months.
• Exposure to PCBs via breast milk did not show a clear effect by age two, but later effects cannot be ruled out.
• DDE exposure did not demonstrate a significant impact on child development in this cohort.