Baby (nearly 5 months) has begun waking three/four times a night - help?

We have a 4 1/2 month old and we've been having the same problem. I asked my pediatrician about it and she said I should not feed her everytime she wakes up because I am becoming her human pacifier. So now I feed her the first 2 times she gets up and if she gets up after that my husband goes in and soothes her back to sleep. I also wait about 5 mins before I go in any of the times she wakes up because sometimes she'll actually just fall back asleep herself. It's been working so far and now she's down to getting up 3 times a night (from 5 times!). We've only been doing this for a week so I hope she'll go back to getting up once a night. Good luck and let me know if anything works for you!