I think it's normal for your baby to drink less formula....don't try to over feed him just feed him what he want and don't worry about the amount and how often....
I'm breast and bottle feeding. I'm also worried that his not eating enough. This my 3rd but first time breastfeeding...my boy only drinks about 10 oz or less and the rest is breast milk. He wight 7lbs 14oz at birth and now at two weeks he weights 9lbs 5 oz so he must be drinking enough milk. :) lol
I don't think you should worry, as long as he's passing his stools and urine frequently. My baby goes through about 12-14 diapers in 24 hours so I know he's taking in enough. I do breastfeed so I'm not sure how much he's taking in, but when I go out I bottle feed and usually he drinks about 1-2 oz every 2 hours or so. Last time I checked a couple of days ago he was weighing 8lbs, 2oz. Some babies drink more and some drink less so it all depends on your baby.
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