There are tons of growth spurts the first few months, so when they wake at night, you can pretty much assume that hunger is a possibility. That being said, if he goes back to sleep with the paci and then sleeps for 3 more hours before waking up, I wouldn't think that would be a hunger waking (with hunger wakings, LOs are very hard to settle and will keep waking over and over again if you try to use a paci instead of feeding). You may need to do some schedule tweaking and just gently extend your A times a touch in order to get some longer naps out of him.
