Gender differentiation in fetal play activity

A recent study by Khladhopper and Schlockmeister in the Journal of Tasmanian Folk Medicine does an extensive analysis of sex based activities in fetuses. [Do not look for this article in your library — it is banned in the US.] One of the results is that male fetuses have a strong tendency to play with toy trucks. As you may imagine, this complicates pregnancy, and makes male fetuses much harder to deliver — except, of course, for the minority that plays with delivery trucks.