A friend had her baby 3 weeks early and she was 9lbs at birth. She is now three months old and only breastfeeding but she isn't gaining weight. Shes 10 lbs at three months. She cries non stop and its a very very unhappy baby cry. She isn't supplementing and said she spits up all the bm she eats every feeding.

I'm concerned and don't know if I should suggest supplementing. I don't want to overstep boundaries with her. I see her one time a year. The Drs gave her a syringe to assist with feeding but she doesn't use it. She also has a cough and eye mucous. I'm Really concerned but should I just leave it alone or try to get her to take this more seriously ...