I have a question... My son who is 3 1/2 months old is continually sucking on his hands. Is this normal for this age, or is he always hungry? I work 8-10 hrs a day and he is drinking BM from a bottle while I am gone that I pump the day before. He gets about 3-4, 3-4oz bottles while I am gone during the day and then I BF him in the evening, night, and morning while I am home with him. Is my son not getting enough milk and that is why he is sucking on his hands, or is it something that this age does? Thanks for the imput.