Book to explain pregnancy/childbirth to 6 to

[AlwaysDancing1234]

Hi, I'm currently 5 months pregnant with DC2. Our DS who is 6 years old loves to read and I think it might be helpful to have a book which gently explains how the baby got in there and how it will be getting out!
We have talked about it lots and have been fairly open and honest with him (within reason of course) but I think a good book, maybe with a bit of light hearted humor would be nice.
I've heard of a book called "mummy laid an egg" has anyone read this and would it be about right for a 6 yo??
Thanks in advance!

Hi OP

We read that one to my DS when he was 6 and he loved it! Now I'm 30 weeks and he's 7.5 he gets really embarasssd and makes me laugh. He tells me the story now and it's led on to all sorts of questions!

Thanks Tomkat we went to the Natural History museum and he was fascinated by the human body/birth exhibition but it did lead to some tricky questions bless him!