
When I had my son we already had two dogs, and I tried not to change their routine at all. I was in hospital for 10 days, so my husband would bring home the baby-gros and my nighties for washing, and the dogs got to sniff the baby's clothes so that they got used to his smell. When I and the baby came home I greeted the dogs before I got the baby out of the car so they were a bit calmer (gratifying how much they'd missed me!) then put the carrycot and baby on the sitting-room floor and let them have a good sniff (whilst keeping a careful eye on everything, of course).
After that I treated the dogs as I always had done previously - if they came over when I was feeding or changing the baby then I never minded, and let them sniff. I felt it was important to make them think the baby was no big deal, and no threat to them. And it worked. I never had a moment's worry.
There are books of advice you can get, and tapes of baby cries so that they're more used to the strange noises! The vital thing is if you are going to change Alfie's routine at all for the baby (where he sleeps etc) then do it
now, well before the baby is born, so that he is happy in his new routine when the time comes.
Good luck - I'm told it's much easier to get a dog accepting a new baby than it is an older sibling!
:)