Like Starangelk, i have also found that 'snacking' can make it harder for bub to drink enough to get a big sleep. Can you take her for a walk in the pram or carrier and get a bit of fresh air?

I'm not sure how prematurity works with the Wonder weeks, but the theory predicts difficult periods at weeks 5, 8, 12, 19, 26, 37, 46 and 55 weeks.