Baby not eating much?

Lisa🍼 • FTM, age 28. Baby is due 6/3/16!
My sweet honey is 7 weeks old and growing just fine, but I feel like he barely eats! During his feedings, he has, at most, 4oz. Is this normal? It's always anywhere from 2-4. And I would say he eats every 2-3 hours. He goes a little longer at night.