I found this on some site.
From Angela, Melourne, Australia:
Prepare your pets for your newborn baby that will be arriving home. Have your friend/s tape a baby's cry, and play this to your pet. This will help them become aware of your baby's cries, and then your pet will not be as stressed out or uncomfortable with the new family member. Allow your pet to sniff any baby furniture or clothes, and observe the animal's behaviour. Sprinkle some baby powder on an item of clothes and allow it to be sniffed before baby comes home. This will also make your pet aware of the changes that will be taking place.
If you have been giving a lot of attention to your pet/s, do not change that dramatically. They need affection and love just as we all do, and if you change that, it could change their behaviour and in return, the pet may resent the newborn baby. Just slowly ease the amount of times of affection, but do not dismiss it altogether.
I am going to try that. We are also getting Diego neutered so i am hopping that will help. We are also going to put him in his pet taxi at night so that he wont get in the crib with the baby and sleep there. I dont think diego will hurt the baby but he likes to snuggle and he might try to lay with the baby.