5 mo not sleeping through the night

My wife is breastfeeding, and she is becoming very tired of the frequent wake-ups of the LO. He often wakes-up every 2 or 3 hours during the night. We tried to put him to bed without feeding again, e.g. by singing, comforting, music, but nothing seems to work except feeding (we don't want to let him cry). At least he falls asleep very easily when she feeds him, so it's not as bad as other situations that I read here.LO sleeps in his bed, in the same room as us. When he wakes-up, I try for a bit to put him back to bed (pacifier/singing/etc.). Sometimes it works, but usually he will end up crying and I will bring it to my wife. She'll breastfeed him while lying down, then when he's finished I put him back to bed (or sometimes we all fall asleep and he stays with us until the next wake-up).When he was 1 month old, there was a brief period of time where he would sleep through the night, or wake up only once, but I read that it's very normal for the baby to wake up more often during some periods. Throughout his lifetime he's consistently been waking up a lot during the night (what I mean is that it's not worse now that it was before).The evening schedule is not very tight yet, he falls asleep at various hours, but we try to put him to bed at 8 PM everyday. The routine is usually just changing diapers, breastfeeding, and (sometimes singing so) he falls asleep.A few thoughts we have:Since my wife is tired and me less so, I'll give him a bottle so that my wife doesn't have to wake upTry other things to put him back to bed without feeding (and without crying) -- e.g. putting him in the stroller (he usually falls asleep very quickly when we go out with the stroller) and walking a littleAny advice? via /r/Parenting http://ift.tt/2a7ahDP