It's ok to stop. It really is. It's not a failure on your part, it's not a sign of being a bad mother. It's ok to just comfort nurse and give your child donated or bought breastmilk and/or formula. The most important thing is spending quality time with your baby and if the pumping and the stress and the frustration are getting in the way of that then it's ok to put that all aside and just bottle feed and comfort nurse.

Trista