Need advice: Baby adding night feeding at nine weeks

.

 A few things I know, we were double swaddling him bc he moves so much. But he was breaking through the bottom of both swaddles and th blankets were ending up wrapped around his torso and neck. So we quickly ordered the magic sleep suit and he's been sleeping in that. He goes down well in th suit, and doesn't seem to be able to wake himself. But I'm wondering if this has to do with his sleeping changing, and if he's actually hungry at these wakings or if it's out of habit or discomfort that he's waking up? He sleeps in his room, and has since week 4, we found we all slept longer. Especially after a feeding. At his two month check up, he was only in the 25th percentile for weight, so I'm knclknded to feed him whenever now as I feel he may have been hungry at night before, but too snug to ask for any food? 

.

I'm ok with whatever he needs of me, just trying to understand what happened and if other people are in the same boat? How many times is your two month old feeding at night, and have you started sleep training?