Problems with newborn feedings

R

Hi mamas! My son is 6 weeks old and has been through at least 3 different formulas. He was spitting up the formula. His np recommended taking him to the hospital to get an ultrasound for pyloric stenosis but thankfully he doesn’t have it. The doctor at the hospital said to cut him down to 3 oz. every 3 hours because giving him 4-5 oz. is too much. I changed his formula to Enfamil AR and he has been taking it amazing and he’s not spitting up anymore. The only problem is that he’s always hungry, and I feel bad for not giving him the extra 1-2 oz. What should I do? Should I stick to the 3 oz. or give him what he normally takes.