How do babies go from cells to flesh within a 40 week period?

Babies go from cells to flesh within a 40 week period because the baby has to form in the belly and then you have to wait until the baby comes out. But, before that even happens you have to wait for the baby if it's a boy to get through the testosterone stage before you could even think about being able to see the baby boy. Now, if you're having a girl you have a better chance of getting through the issue for birth a little bit easier. Another thing that happens to your baby in your tummy is if you're having a boy in the middle of the process the baby's little veins in his head disconnect and then connect in the later stage right before birth. If you're having a girl don't worry she's keeping all her veins connected.