Hello due to C-section delivery and less milk supply we feed our baby formula milk by spoon.. as soon as my milk flow increase I have tried to breastfeed my baby but she rejected.. so doctor suggested to feed her by using Breast shields.. now she is 2 months but still refusing to breastfeed and I'm feeding her by nipple shield only.. it is very painful for me to feed her by nipple shield.. what to do???? how to teach her??