A new study has suggested that plastic chemicals could be 'feminising' the brains of baby boys.
The research took place on a group of pregnant women, with those who were found to have a higher concentration of two phthalates in their urine producing sons who are less likely to play with male toys such as trucks and toy guns.
The study took place on 145 pre-school children, led by the University of Rochester Medical centre.
Phthalates are chemicals used to soften plastics, and are most often found in food products.
The study linked two particular types, DEHP and DBP, to the change in the behaviour of the boys. There was no significant changes in the behaviour of the girls.
Worryingly for future generations, the early results suggest it may also affect the development of genitals in males. At the moment, these results are only confirmed in male rats and are still being checked for human boys.
The findings further back up the theory that hormones have a large influence on the behaviour of children.
Does your son like playing with stereotypical boys toys? What do you think about the findings? I don't think the makers of GI Joe and Lego will be quaking in their boots quite yet.