I'm not so good at amounts, but I think that 90 mL wouldn't be too little -- 190-200 sounds like a lot for a 12 week old. I might give it a few days before messing with anything else -- then after a few days I would probably try to resettle at that first waking and see if that gets your anywhere. Or, you could do a quick attempt at a resettle after 2-3 hours (I used to try to walk them around for a few minutes or maybe rock them to sleep), but don't persist for long.