How much should i be bottle feeding

Hello everyone! I had my baby back on 6/7. She was tiny 6lb 13oz at birth. She fell to 6lb 2.8oz at discharge from hospital. At her 1 week appointment she was 6lb 3oz. We have been supplimenting formula initally as the hospital said she lost too much weight. We are now giving mostly breast milk in the bottle but give 40ml whether it's formula or breast milk. Baby is always content after feeding off me and falls asleep so we dont wake her up to give a bottle after anymore. Also content after the 40mls. She eats roughly every 2 hours and sometimes more often during the day which we wake her to do. She eats closer to the 3 hour mark at night and we also wake her to eat then even though her pediatrician saud let her sleep as long as she wants. She will be 2 weeks friday. How much should I be giving her? Very worried about her seeming to have a slow weight gain.