Hi,
My DD is 6 and half months old and she also was a good sleeper until 2 months old and she had a cold. Well from 4 months until a few days ago she used to wake up EVERY hour at night. We started doing the NCSS and things are improving, but she is also teething. We started putting night time orajel on her and for the first time in months(can't even remember) she gave us 2 3-hour stretches

. Mind you, I am very excited because I can't remember the last time she gave us that. Well at 2 am she was wide awake and biting her lower lip and just wanted to nurse for like an hour. I'm assuming the orajel wore off and she was uncomfortable. Anyways, long story short, try Orjael