Difficult to latch

Monika • 4 years of infertility, 4 ivf cycles. Miracle baby Elias 01/2019 👪, another on the way. Miracles happen

Because of the c-section my milk came late. This was the reason I was breastfeeding and bottle feeding at the same time. Now 2 weeks postpartum my baby just eats 2 oz (30-40ml) each time I breastfeed. Then he got very sleepy. I give him a bottle of pumped milk and he eats well. If I try to let him sleep just after breastfeeding without bottle he got very angry and refuses even my breast. I am not so sure how to teach him to latch more. Anyone with advice please???