If you want to prepare your child for there being a new baby in the house, then social stories or books might be a good place to start. 

Here are some suggestions for some books that you could read with your child:

• What's in your tummy mummy? - Sam Lloyd
• We're Having a baby - Campbell books
• New Baby board books - Rachel Fuller - These are a series of board books to prepare from before the baby is born until after the baby is born.
• There's a house inside my mummy - Giles Andreae