My son is 3 1/2 months old. He is gaining well with no problems. The amount he eats dailing had increased around week 11 at his growth spurt and has continurped to remain high. Recently he has been quite ravenous in the evening. Very hungry. Falls asleep after nursing then awake after 10-15 min and hungry again. This goes on 3-4 times. He gets fussy because he is tired. He is sleeping one less hour now during his first stretch (his longer stretch) or sometimes less than he did before and also wakes for an additional feeding. He also isn't napping well. I don't think my supply is enough for him. I am now pumping less at work than what he is eating. I am trying to increase it without success at this point. It is starting to stress me out. I am considering supplementing with formula in the evening. I am thinking 2-4 ounces of formula (while pumping at this time) and then nursing after if still hungry. What I'm looking for is some suggestions and if you think what I am thinking of doing is right.