Is there a way to manipulate an unborn sim's supernatural status?

[NBalchemist]

I got Supernatual a little while ago, had a witch and faery get married, so far they've had two kids, both are faeries. I'd really love for them to have a witch too, but I'm worried that they'll just end up with another faery. Is there a way to manipulate what type of supernatural the baby will be, like how you can manipulate gender with watermelons or apples?

[Cristina]

I never heard of anything that can do that but you could try saving before the baby is born and quit without saving until you get a witch