My miracle baby is 3 weeks old and I'm breastfeeding and expressing.

I have inverted nipples so my paed suggested that I express aswell.

My question is.... baby has been on the boob almost the whole day. Hubby then decided to give him a bottle of expressed milk... 80ml... babba finished it and then still wanted boob.

I know breastfed babies love the boob for anything. But is he getting enough if I just breastfeed? I'm a FTM so just want to make sure he is okay and his tummy is full.