my cousin by marriage recently had a little boy he will actually be 6 months old on January 3rd of 2016 and I am a little concerned about him and thought I could get a little advice. I have convinced them to change pediatricians to the one that I use for my children and this is the first child and so they really don't know what to do but my concern is he is almost 6 months old and he doesn't weigh but maybe 13 pounds at the most . he eats a lot and he's eating cereal also mixed in with some milk. he wears newborn size clothes. he's very alert and very active but he also has a knot on the back of his head on the right lower side but the doctor that he was using stupid that was part of the mothers hormones Willie had some knots under his breath but those are gone now so I believe him on the hormone park there but not as much on the back of the head so I was trying to get a little advice to see what I needed to do and to help show them in which direction to take