and for a first attempt it's very good indeed. A couple of initial reactions:-
1. Your homepage would benefit enormously from having some images. People buy with their eyes, and where websites are concerned that's especially true. Hook visitors with an attractive image or two, but be careful. As I'm sure you're aware, you must be especially cautious with images of children on the web, and my advice would be to stay away from anything that shows a child alone - either go for a nice group of kids, or show a child with a mother.
2. Include an internation dialing code prefix on your phone number. Always think internationally when designing an e-commerce site. That way, you'll look friendly to a potential customer in Osaka, or Shanghai, or any one of a hundred different locations around the world.
3. Free deliveries on orders over £35 - do you really mean that? I recently sent an air-freight parcel of documents and CDs to a client in Fiji, and it cost £18:50.
I like your terms and conditions and privacy text - you've covered the ground well.