Bisphenol-A (BPA) is known to mimic estrogen and has been linked to diabetes, asthma and neurological problems, but a recent study from the University of North Carolina - Chapel Hill and Canada's Simon Fraser University indicates that BPA may also influence toddler behavior. In a study of nearly 250 women, scientists found that those with the highest concentrations of BPA in their urine at 16 weeks of pregnancy later had more aggressive, hyperactive daughters when the children were tested at two years old. Estrogen, which BPA can mimic, is known to affect the development of sex differences in fetuses. Studies conducted on mice have also shown that fetal exposure to BPA can result in more aggressive female children.
Since this study focuses on the result of prenatal exposure to BPA, it sounds like it's a good idea to look for BPA-free labels on your own water bottles in addition to shopping BPA-free for baby.
I try not to be freaked by things like this but it is scary. I used a nalegen bottle all through pregnancy thinking it was better than disposable water bottles — onl to learn after birth that the hard plastic reusable bottle was made with BPA.
I believe nothing is 100% though and i did the best I could.