Have some questions who has more experience than me

Hello ladies, I was just wondering, I start giving aptamil porridge to my boy since he was 4 months once a day after a month star giving him 2 a day, he eats a lot of porridge and I know that I still have to give him at least 600ml of milk a day, that's what I do, he's nearly 6 months and wondering when should I give him 3 times a day porridge? cause he loves his food so much haha.