DD will be 4 weeks tomorrow. Today she has been on the breast pretty much non-stop. She used to sleep between feeds, now she sleeps a bit (30-45min) and then wants feeding again. Feeds are 45min-90 min apart and she is screaming if I don't feed her (we had to go out earlier and she screamed bloody murder even though she had just fed!). My brain says growth spurt but my wobbly side fears that she's changed overnight! Any advice/experience?