Increase milk supply/fatten up breastmilk

Bri

My daughter was born 8lbs 1oz. A month later and she’s 8lbs. Doctor is concerned she isn’t gaining a lot. She’s breastfed only. Anyway what can I do to help her gain weight? Or fatten up my breastmilk?

I have to go back to the doctors in 2 weeks to check her weight. If she hasn’t gained a lot then I’ll have to supplement with formula and I’m trying to avoid that