If this was the first time your dog saw a baby in a carrier it was probably curious to him and took more than a second look. I try to introduce my young dogs to everything I can find, often standing in front of the grocery store off to the side of the doors so they see children, babies in carriers, other dogs in carriers, shopping carts, wheel chairs, what ever comes in. The more your dog gets to see the easier they will accept new sights as long as they are confident and not fearful. Make all new associations positive if possible. It also helps them learn to accept new stuff by judging your reaction to the new thing they see.
Snake Vom Eselspfad RN CGC (AKA Raina) 3/5/08
Pyrate CGC 4/1/03-5/16/12 RIP
Too many to list waiting at the bridge but remembering them all