How much milk?

Fiona

My little man is 18 weeks, and his feeding sessions (BF) are about 8-10mins in total during the day. He has 1 mega session at night but that's about 20mins. When he has an expressed bottle or formula in the day he only takes 80-90ml....how much are your babes drinking?

He's producing enough nappies, but I can't get him weighed because of Covid, but he looks healthy....