this is a weird questio but... how can i get birth? xd (sorry for the grammar errors, English is not my first lenguaje)
You get only get pregnant from the bunny girl currently. After that, you have to defeat the cat girl, Momo and once you defeat her, go inside her house and talk to her when she's inside. She'll ask if you want to give birth but you can only do this once you're 100% into your pregnancy. If you're not 100% just wait a bit and then come back to the house and talk to her again.