DD is 7.5 weeks and sometimes she has days where she just doesn't seem to want to eat. She's not fussy but she will latch on, eat for a minute or two then slow down and pull off. She'll relatch/pull off repeatedly and kind of let the milk dribble out of her mouth instead of swallowing. She will do this for 30 min or more if I let her. Then if I put her down she starts sucking her hand like she's still starving. Most other days she is perfectly efficient and drains each breast in 5-7 min. What's her deal??