Hi T.,
You didn't mention whether your son is breastfed or bottlefed. Breastfed babies usually cannot go an entire night without feeding at that age. So, if you are breastfeeding and having to put the paci back in his mouth more than 2 or 3 times, I would say definitely feed him. If he is bottle fed he may be able to go all night without feeding, but at that age, it is also possible that he may still be hungry some nights (i.e., if he is about to go through a growth spurt). So again, if you are having to put the paci back more than a few times, you may want to offer a bottle. I went through this with my oldest daughter. She was bottle fed (refused to nurse from day 1--my two younger daughters both nursed without a problem--I know, very weird). When she was about 3 months we realized that she was only having a few sips of formula before falling back to sleep. So, we started putting the paci back in her mouth when she woke up. Like you, sometimes it was only twice a night, other times it was more--but I don't think it was ever more than 4 times a night. If she'd woken more than that I think I would've fed her. I think it took until she was about 5 months before she was able to find the paci in her crib and put it back in her mouth herself. And, it was gradual...some nights she could find it, other nights she would wake us up b/c she was searching and couldn't find it anywhere (it would often be stuck between the matress and one of the slats of the crib). So it may be that your son just needs to develop a bit more to get to that point. Be patient with him...when you become a parent, sleep deprivation unfortunately goes with the territory! Best of luck to you. :-)