Bottlefeeding problem

Hi mga momsh! Si LO ko po is 2 mos old na ang we are on exclusive formula milk feeding. Ask ko lng po if normal lng po hindi niya mauubos ang 4 ounces in one feeding? Usually 2 ounces lng then after an hour or two 2 ounces nmn. Instead na every 3 hours ang feeding nagiging every 2 hours nlng.