thoughts would be welcome. What an awful dilemma for you,and how anxious it must make you with a toddler around. Can the dog not be kept in another room with a gate between him and the baby? Obviously you cant keep an eye on both 24/7 but dogs can and do inflict nasty bites. Im fortunate my dog is great with my grandchildren but they are older. Babies dont understand about giving a dog space. If it came down to the baby or the dog then personally it would have to be the dog.As hard as that decision would be the baby needs to be kept safe. Have you thought of buying a soft muzzle for when he's around the baby that may be your answer. Im sure more experienced dog owners will have advice for you. Has he been checked over by a vet, in case there is some underlying condition causing the aggression...? Dogs in pain can sometimes display problem behaviours. Your vet should also do blood tests - there are other folk on here who will no doubt offer more detail on the specific tests needed. Assuming all is fine physically, then a trainer or behaviourist should be your next step. Someone experienced who ONLY uses positive methods. Stay away from anyone who talks about being 'alpha' or 'pack leader'! Once someone experienced has assessed your dog, you will have a clearer picture of whether the problem can be 'solved' or managed. I wish you the best