Re: watery milk
First of, I don't know why the ped told you he's eating too much... but I would continue to feed him on demand...if he's hungry (and you know when he is) feed him!
Secondly, what you pump can't compare with what the baby is acutally getting. They can get milk out of the breast better than any pump! Get 2.5 oz is pretty good. As far a the watery milk goes, you maybe getting more foremilk than hindmilk...try massaging and compressing the breast while pumping next time. Also how long are you pumping for?
Married mama with 4 kiddos...2 girls (11 & 6) and 2 boys (21mo & 3mo)