Like youre dog she was our baby before we had our daughter almost 2 years ago. I remember worrying about the same thing when I was pregnant & I spoke to my midwife about the best way to deal with it. She said to me just coz you have a baby why does your relationship with your dog have to change? Her advice was to deal with the dog as you would an older sibling. You wouldnt leave an older sibling alone in the room with the baby unsupervised so dont leave the dog. On the other hand dont leave the dog out either & dont push her to the side. Try when your lo is having a nap to do something fun with your dog, even if its just a wee cuddle. When it was time to give our lo a bottle we would always give our dog a little treat too so as she didnt feel left out. We even got her a new toy for when the baby came home from the hospital.
It did take her a few days to adjust but it really was only days & not weeks & to this day she has never even growled at our daughter. We do have a strict rule in the house though that if our daughter lashes out or does something that is not nice, like pulling fur, ears or tail, that it is straight to the naughty step. I know all this sounds quite over the top but it was really important to us that our dog could accept the baby & still feel as loved as ever. Our next baby is due in nov & we will be doing exactly the same this time, except we'll have '2' siblings to contend with this time.
Good luck with everything & hopefully this has been some help to you
Hilary x