Drop in milk supply! Anyone else?

RaeAnn
So my little guy Dalton is now consistently sleeping 7.5 hours throughout the night (yay) or so you would think but my milk supply is dropping significantly ! And during the day he doesn't eat as much as before. So today I'm going to start pumping every 2 hours to get my milk supply up. Yesterday I pumped after him taking a 5 hour nap and got 3 oz! Which alarms me! I go back to work in a week and a half. Is anyone else's little one not eating as much ? Could this be just possibly growing ?