Babies aren't supposed to have "room" to flail around inside the uterus though.  They're supposed to be tucked in there.  If they aren't "tucked" well enough, they risk wrapping themselves in the umbilical chord.  Especcially during the third trimester, which is just baby growing as much and as fast as it can until it's born. If the hammothers did ANY sort of prenatal research, they'd know this.