Do babies get erections when they are still in their mother's womb?

Question

Just as the title indicates... is that possible?

Answer 1

there has been a study that boys 16 weeks gestational age have been found having erections:

Close observation has brought many unexpected behaviors to light. By 16 weeks g.a., male babies are having their first erections. As soon as they have hands, they are busy exploring everywhere and everything, feet, toes, mouth, and the umbilical cord: these are their first toys.

http://www.terrylarimore.com/BabiesAreConscious.html