How to Predict Your Baby’s Sex, 1684

Ulisse Aldrovandi, Monstrorum historia (1642)

If it happen to be a Male Child, then the right Eye of the Woman will, to appearance, move swifter, and sparkle more than the left… her right Cheek will often glow, and be more ruddy than the left, and indeed the whole colour of her Face more lively than at other times, she feels less Sadness than if she conceived a Female.

Aristoteles Master-piece

If the right side of your face is looking a little bit like an anime character, you’re probably having a boy. (Also, I have a sneaking suspicion that the seventeenth century was not hoping for a girl.)