best answer I got from a lactation nurse was to first put a drop of breastmilk on my finger and let the child learn with my finger in their mouth not to bit down so hard. Suprisingly it worked but ya have to do it at every feeding till it stops completely. The bone in your finger they cannot obviously bit through. Also rub their bottom lip and tounge before the latch, as soon as they open wide put your nipple in their mouth. Worked for me, good luck!