I have been back at work for about 3 weeks now. I nurse LO in the morning - then she gets bottles during the day - then I try and nurse her when I get home. She latches right on, but only nurses for a few minutes and pulls off. She use to be an aggressive nurser - she has always gotten a bottle here or there, but now I feel she gets the first let down and won't work for the next. I'm worried she's not getting the hind milk. Any suggestions on how to get her to be a more aggressive nurser??