Exposure to certain chemicals during early pregnancy may influence how a baby’s immune system develops, according to a study partly funded by the NIEHS Superfund 
Research Program (SRP). The scientists discovered that some per- and polyfluoroalkyl substances (PFAS) and metals may alter how an infant’s immune system 
responds to environmental triggers.  
  
See: https://tools.niehs.nih.gov/srp/research ...