The experiment:
The women, who gave birth to 74 boys and 71 girls, were followed up when their children were aged four to seven and asked about the toys the youngsters played with and the games they enjoyed.
The result:
They found that two phthalates DEHP and DBP can affect play behaviour. Boys exposed to high levels of these in the womb were less likely than other boys to play with cars, trains and guns or engage in "rougher" games like playfighting.
DEHP - used to make PVC soft and pliable, used in products like flooring
DBP - used as a plasticiser in glues, dyes and textiles