DD is 20 weeks (14 weeks corrected age as she was prem) and has recently started doing this. she will feed well for the first half of the feed, then once she's had a reasonable amount will yank off.
she'll go back on if I offer, but will then yank off again quite quickly. as a result it is hard to get her to take a big feed at the moment, she is preferring frequent smaller feeds.
she seems quite happy - in fact she will sometimes turn and smile at me straight after yanking off! which would be charming if it didn't bloody hurt.
is this normal? is it just a phase? or could there be something wrong...?