nearly 5 and sex ed.

My eldest ds has been making me chuckle so much lately, he's obsessed with my bump..even though ive still not told him im having a baby..he's told me i am, when ive asked him this he has said because your belly is "SO massive mummy" (gestures by sticking his no exsistant bump out as far as he can and rolls his eyes). According to him , you go to the hospital and the drs give you a baby and it hurts lots. Last night at bath time he started asking me lots of questions about how babys get in mummys tummys. Ive allways said id be truthful with him when the time comes and usually after a few questions he gets distracted by other things. Last night he asked me again "why haven't you got a willy mummy", because im a girl ben " oh yes you  have 2 bums then?" (ben calls my vagina a front bum..again not a name ive told him.)  Yes ben a front bum and a back bum. "mummy when the baby comes out it will crawl down your tummy and come out of the hatch in your front bum"..will it ben? "yes mummy..Mummy how does the baby in your tummy?" so here comes the sex ed for a 5 year old.."well daddy has seeds in his body that he puts in mummy and the baby grows and grows like a flower seed in mummys tummy , and one day like a flower it will get so big that it will pop and out comes the flower , just like the baby will get to big to stay in mummys tummy".. ds replys "ooh ok so ive got seeds in me because im a boy?" ..yes ben "sooooo are seeds like beans then?" Yes ben sort of "ooh okay can i be a baked bean then because i don't like kidney beans"..Then a 10 minute game and conversation about kidney beans and jumping beans begins. How i envy the imagination a 5 year old and innocence a 5 year old is allowed to have.