Feeding too much

My little guy is 9 months now and we have been trying to do three meals of solids a day for a couple weeks, but I feel like I am constantly feeding him and that he is getting too much milk. He gets mostly breast milk in a bottle but one 6 oz formula bottle. So in one day we do 5 bottles (5-6oz) plus three meals

He is up for about two hours in the morning and then three hours between nap1 and 2. So after his first nap he gets a bottle right away then lunch about an hour later and then another bottle before his next nap to make sure he is full.

I know I’ve heard that you aren’t supposed to give any less milk/formula when your baby begins solids...Just seems like a lot