Bisphenol A (BPA) is a byproduct of plastics that are used for food and drink packaging.  There is growing concern that exposure to BPA may have adverse health effects especially in children. This study assessed the association of BPA exposure on young children while they were still in the womb (ie during gestation). and found that:

High levels of urinary bisphenol A measured during gestation were associated with anxious and depressed behavior and poorer emotional control in children at age 3 years.

The original study can be found at: Braun JM et al. Impact of early-life bisphenol A exposure on behavior and executive function in children. Pediatrics 2011 Nov; 128:873.

or via Gestational Exposure to BPA Linked with Behavioral Effects – Pediatrics and Adolescent Medicine.