Problems with diagnosing a dog as “aggressive” arise from human misunderstanding of canine social systems, canine signaling, and canine anxieties about contextually appropriate responses to unfamiliar situations.
Break bad habits
MOST IMPORTANT— Exercise, Exercise, Exercise. About 50% of his interaction with you should be some form of working off excess energy.
Be the pack leader your dog wants you to be.
Dogs show love by showing respect, and you can do things to gain your dogs respect, and thereby his trust.
Dog Proofing your child/dog
You will want to immediately dog-proof your child to prevent a bite, or worse. Use common sense. Show your child by example. Anticipate problems.