My baby boy is 19 weeks old. His weight is great (16.5lbs) and he has plenty of wet and dirty diapers. He nurses around every 2-2.5 hours. For the past couple weeks he has been spitting up a lot, almost every feeding and it's always quite a bit. He has also been having mucousy poops and bad gas. Does this sound like a cow's milk allergy and is it normal for this to develop at 4 months old? What can I do to help my little boy feel better?