Re: 3 months old - how much per day?
I agree with feed on demand. Don't make up a huge bottle, somewhere around the 4 oz range is probably about right. You can make bottle feeding closer to like breast feeding by holding them close and watching their cues. If they pull off - don't force the nipple back in. It's easy to over feed a baby with a bottle. It might take you a week or so to figure it out but you'll know from watching their cues soon. Good luck!