my daughter didn't sleep through the night until she was 11 months and my son (7 months) still doesn't sleep through the night he wakes 1- 5 times... depending on what went on during the day, how much he ate during the day, if he is teething (right now he is)... even my daughter wakes regularly, but around 11 months she quit needing us to solve her night time issuse about 90% of the time... there are still occasions where she still needs us, poop accident, doesn't feel good, etc... I have to admit even I don't sleep through the night most nights... never have and I'm 32. Breastfed babies need to eat more often than bottle babies. I personally think 5 months is too early, but thats my opinion so take it for what it is worth. I just resigned myself to the fact early on with my daughter that I'd be up more than if I gave her a bottle... I never let her cry herself to sleep... it just didn't feel right. Some may say I broke lots of the rules about getting kids to sleep on their own... I just had to believe that if it took me nursing, rocking, wearing her to bed to help her I would do it... she didn't need assistance every night, but most... for a long time, but despite what they say she didn't have trouble teaching herself how to fall asleep when she was ready. We did establish a night time routine early on... we started diming the house lights about 30 mins before bed. We read a book, feed the fish and watch them eat then say good night to them and turn their light off, we say good night to our toys as we put them away, then go to her room say good night to her favorite animals on her shelves, to her monkey lamp and turn on her twilight turtle (it is a night light that stays on for 45 min... we found that most nightlights kept her awake if she woke up later) then we would turn on her FP Ocean wonders Aquarium and we sing alon with it as we put her in bed with her taggie and tell her night night... she would watch the aquarium and fall asleep. It didn't work EVERY time, but it worked more and more over time... now we just ask her if she wants to go to bed and if she is tired (she normally is around 8pm) now she will walk to her room and get in her bed. So When the books say not to nurse to bed that it is a bad habit, I totally disagree... I did that with my daughter for most of the first year along with our routine... over time she out grew it.
With my son I keep him in the arms reach co-sleeper and feed him or snuggle him when he wakes up. It doesn't disrupt my sleep near as much and truth be told I sleep better with him next to me. I do not believe that it prevents them like I said before from learning to settle themselves when they are ready... I know from experience with my daughter... she isn't 2 and most of the time she will settle herself. I believe that by responding to them early in life they have developed a sense of security that the cry it out method doesn't provide and as a result have more self confidence and more trust in us.
My best advise is listen to you heart.