Anyone LO have slow weight gain?

LaBe44a

DS had his 2 month check up yesterday and they said he isn't growing as much as he should.  He has increased in both weight and height, but not as quickly as they think he should.  He is now only in the 4% for weight and 13% for length.  The pedi's rec. was feed him more often, between 2 and 3 hours during the day, but let him sleep at night.  That is fine, we want our son to grow, but now my body isn't producing enough.  I have a freezer stash, so we are dipping into that, but what else can I do to get my body to produce more?

I have oatmeal for breakfast, am well hydrated, pump after DS is done feeding.  I realize it will be a gradual process, but can anyone give me hope that my slow grower will be able to catch up once my body figures everything out?

Definitely rambled, but it hurt a little to hear that DS was only in the 4%.