Advice for a 3 week old kitten

Okay so about a week ago we took in an orphaned kitten his mom got sick and coudn't care for him, so we took him in when he was 2 weeks, we know a lady who raises orphaned kittens and asked her for help, so we have been feeding him every 3 hours, and he ate about 10 mls from the bottle every time, a couple days after we took him in he was sneezing a lot and havering trouble breathing, which we figure it was what the mom had, so we got him some medicine and he seems to be doing better, he's not sneezing as much and he seems to be more active, but he has stopped eating as much, he just doesn't seem hungry anymore, he will only eat maybe 4 ml now he weighs 6onces and he's 3 weeks, is there anything I should do to get him to eat more, or does anyone else have any tips on helpful things? Any info is much appreciated
Asked Jul 29, 2015

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