I have tried to pump a little bit to start having a supply when I have to go back to work and so I can have a break. We gave baby a bottle 2x in one day before she was 2 weeks so I could get out of the house for maybe 30 min and since then I seem to have issues with breastfeeding. She will not latch properly all the time and gets impatient after the first let down and starts pulling off or bitting the nipple (nipples are always sore and pinched). Anyone have the same problem? Any advice? And when did you start using a bottle?