2 month breastmilk bottle feeding

Hi mummies, I would like to check with you guys on breastmilk feeding. I’ve been exclusively latching my babies for her milk. Recently I’ve started bottle feeding her to train her for infant care. She has been adjusting well but her trend is to consume an average of 300ml per day. This is only from day time 7am-6pm, bottle fed breastmilk. Night time i would breastfeed her directly. Is this normal, should i see a doctor?