My mother had a chi when I was born and, up until my birth, the chi was the baby of the house (and she actually was treated better than I ever was as a child!).
My mom had the same concerns that Tammy (the chi) would get aggressive towards me out of jealousy, etc. But Mom always tells me stories about sitting in a recliner with me at 10-14 days old, feeding me a bottle and Tammy on her lap with us, licking my toes and loving on me. She was never aggressive towards me at all and I think she died when I was about 2 years old.
We also had a male chi that we got when I was an infant who was the same way. He was a little less maternal with me and my sister but he loved us dearly and actually followed us around like a babysitter.
The only advice I can give you for the introduction of baby and chi is that maybe you (well, your hubby/bf, mom, dad, whoever!) could bring a blanket home with both your scent and the baby's scent on it before you come home from the hospital. Put the blanket in the pup's favorite spot and let him get used to the scent mixed with yours so it's not completely foreign to him when you and the baby come home. Then just let him look and sniff the baby and introduce them slowly.
And, of course, don't forget to show him loads of love and affection - but that's kind of hard to forget to do.