Where do babies come from- book recommendation for 3 year old

[TiredandGrumpy2014]

I'm pg with dc2 and dd is excited. So far we have the house in mummy's tummy book but yesterday she asked how the baby got in there. I mumbled something about an egg! But I do want to be up front with her, so looking for a book recommendation which will help me pitch it for her age. She's 3.5, will be nearly 4 by time baby comes. She's got pretty good understanding and verbal skills. Thanks!

My 3 year old loves Amazing You. It doesn't cover sex but is all about the body, private parts, eggs, sperm etc. It's quite graphic but child-friendly pictures of eggs whizzing down fallopian tubes etc

Amazon link

There is one from Babette Cole called mummy laid an egg

there's a book called where willy went that I've often see recommended

Thanks everyone. I will check those out!