According to a new research, there is a possible link between prenatal exposure to the chemical bisphenol (BPA) and increased aggression in girls, not boys, at age 2.

The finding is not yet conclusive but this is the first human trial to attempt to examine whether prenatal exposure to BPA in the womb reflects on the behavior in early childhood.

BPA has been commonly used to make plastic bottles and to line canned foods including a range of commercial goods for over three decades.

The chemical was detected in the urine of over 90 percent Americans in a random sample carried out by CDC researchers in 2007.

In a recent study researchers followed 249 women during their pregnancy until their children were 2 years old.

The level of BPA concentration in the urine of would-be mothers was measured in their 16th and 26th weeks of pregnancy and immediately after delivery.

When the children were two years of old, the mothers completed a widely used behavior survey designed to judge their child's personality with special attention towards internal and external behaviors.

Researchers concluded that exposure to girls of the highest levels of BPA earlier in pregnancy tended to display more externalizing behaviors at age 2 than those exposed to lower levels.

In most of the cases the behaviors did not reach the level of causing any concern.