Formula and solids


Hi all, looking for advice. My son got the go ahead from the doctor to start solids. He was about 5.5 months when we started and will be 6 months on the 26th. We’ve started with purée and cereal. He’s been having cereal for breakfast after his bottle and then purée veggie for lunch after bottle. He normally drinks 5 6oz bottles a day. Seems since we started solids he isn’t as interested in his formula. He still has about 5 bottles a day but sometimes is only finishing 4-5 oz. is this normal?