A childhood belief about reproduction

i used to think that woman would get pregnant when a man would put his mouth on the woman's vagina and spit into it. The spit would than transform into a baby. After spitting, the man would than blow air into the woman's uterus (as if it were a balloon) in order to give the baby air to breathe. I thought this was the only reason a woman was so fat when pregnant. I couldn't wait until i was older and got pregnant because i came up with the idea that I could simply have a plastic tube with one end up my vagina and the baby could breathe through the tube. That way i could avoid being fat. I felt incredibly stupid when i realized the truth. i had no idea about male anatomy back then.