I love bein a (I love being a) I love bein a TEENAGE MUTANT NINJA TURTLE!
Apparently if you have 2 children of either sex you have about an 80% (?) chance of having another. I believe it is because you may be genetically more likely to have that particular sex and this therefore skews the statistics. Of course, I am a 3rd child and a sister to 2 brothers so it does happen