6 month old baby girl

Hi mummies, need tip how to get baby to drink more? My baby girl only drinks 720ml total in a day despite recommended milk intake that depends on her weight. Even when we push her to drink she will tend to vomit it out or wont drink at all, and she sleeps thru the night. And due to this milk intake, sometimes she gets constipated. Currently she drinking karihome stage 1.