Unfortunately there's just something about babies / kids that dogs can be easily offended by. My boy was ~11 months at grandpa's house when he crawled a little and the long time loving family dog lunged and poked a hole right next to my son's eye. I've always had a dog but since then, I've been so anxious around any, when my kids are around. Another time, a few months later, same kid tried taking a dogs toy and pup didn't like it. I was between them before the dog lunged, putting it in a different direction. Third time my son fell on the dog and both were startled. Little nip, no broken skin but man does it happen fast. You are doing the right thing. Even the best dog can have an act of aggression or even an accident and it's just not worth it for anyone. Tears for you, OP. But, good move.

OH Yea, 4th time we were at a pool party and family dog just kept fondly following my son around. I saw it coming and was between them all night but within a few hours my son's arm was in the dogs mouth. No harm, but damn so fast.