Not enough milk intake?

Hi, it’s recommended for babies to drink 600-800ml of milk per day after starting solids. But my baby takes an average of 5 feeds per day, of which 2 are replaced by solids. So that makes the milk intake around 400-500ml per day. Could anyone enlighten me if that is sufficient? We do look at baby’s growth, wet diapers etc and all are on track. Just don’t want to shortchange baby in terms of nutrients from formula milk.