My oldest is 7 and so far I've just answered her questions. She hasn't asked for the 'how' yet as far as intercourse but she has asked things that have lead to it takes a mom and dad or male and female to produce babies. With her personality she just doesn't care yet... I wouldn't be surprised if my 4.5 year old asks more details sooner. So far I've just gone with answering questions as they have been asked, but I think if it doesn't come up in the next 6 months I'll bring it up. I just want to open the door before other kids do.
DD1 (7) DD2 (4) DS1 (22 months) Baby #4 EDD 7/13/14