I am so sad for the baby.  Remember everyone, a dog acts on instinct and not logic.  I've owned dogs all my life and know that they react to body language.  Although to us a baby is no threat it may not be so for the dog.  The occasional strange staring look that infants have could be confrontational to a dog and trigger a high alert instinct.  Add to that the screaming and arm waving and the situation can become volatile.  It is your life, your child, your dog,....beware!