Hi My son who was 8 last month has had a similar question.. We told him how babies grown ect and how sort of how they get in there.. We said daddy put the baby in there in a special way and then of course he asked.. but then we said right now we don't think you need to know all the details.. it is just somehting that only grown ups do so in another year or so we will tell you all.. and it seems to keep him happy