M.K.
My daughter did the same thing when I was pregnant with her little sister. Everything I read just said to give a very vague answer, to which most kids are happy with. For example, when she asked me how the baby would get out, I explained I would go to the hospital and the doctor gets the baby out. Its not a lie, but its not the detailed truth for which she is not ready. She asked how the baby got in there, and I explained that when a mommy meets a daddy and they're ready, thats how a baby gets in there. Its not a lie, but I left out details. I hope this helps.