Change on milk scoop

Hi po! Good evening! nag change po kasi ako ng scoop ng milk (S26 Gold) ni baby. from 2 scoop for 4oz ginawa ko na syang 4 scoop for 4oz. nagstart lang po ako yesterday. and as the 2nd day na ginawa ko sya today. hindi na nauubos ni baby yung milk. nagdown to 2oz lang nauubos nya. and almost whole day syang sleep. bakit po kaya ganun bigla? hoping may makahelp. #medyonappraningna1sttimemom