Don't worry, I'm in the same boat -- Devon's 9-1/2 weeks and she went from sleeping about 8 hours a night to waking up every four or five hours...Actually, over Thanksgiving, she was sleeping 7-1/2 to 9 hours a night and the minute we got back home, she went right back to the every four or five hours...Last night she had about a six hour stretch, so she's heading in the right direction, but I was hoping that since she's getting older, her sleeping would get longer, not shorter! I'm hoping it's just the nine-week growth spurt thing since she's also been eating a lot, but, for example, she's barely slept today...I think she took a half-hour nap...Plus, having a three-year old is exhausting enough, so I'm soooo tired today...It could be a growth-spurt thing though, in both your case and mine...Nine weeks is supposed to be another growth spurt...I know, I also wondered if something I had been doing might be throwing her off, but I just don't know what it could be...I mean, for example, we didn't even have Devon in the miracle blanket over Thanksgiving, just a regular swaddle blanket, so we thought that might work when we got back -- yep, no way. So we went back to the miracle blanket...It's really frustrating, and I know she's still sleeping a lot, but when you have another child, sleep is a hot commodity!