@Michael – I actually consulted a lactation consultant, but unfortunately she wasn't much help. She seemed much more interested in issues with breastfeeding than bottle feeding, which is unfortunate. I appreciate your suggestions, (I can use all the help I can get), and plan to try the tricks you provided. We gave him a bottle today and were quite successful. Now, we'll see if it was a one time occurrence or a repeatable event!

Stick with one bottle, as the previous commenter said. We had better luck with a regular flow nipple rather than a slow flow nipple at 1 week old, so babies do vary on what they want vs. what the manufacturers recommend. Some of the tricks the consultant used that we hadn't known were to push his cheeks in, to support his lower jaw and move it up and down slightly, and to angle the bottle to apply some downward pressure on the tongue. Some of this requires having three hands, and it was all much easier after having the consultant show us exactly how to do some of it.

We've gotten our little guy used to refrigerated or room temperature formula, but he definitely responded differently to different temperatures at first.

Best of luck!