6 week old eating less

Marisa

My baby is eating around 16-19 ounces a day.. she used to eat 24oz. But she does t seem to be finishing her bottles.. She is eating considerably less during the night because she sleeps 4-6hrs at a time.. usually I feed her around 9/10 then put her to bed and she doesn’t wake till 3/4am to eat.. doctor said letting her sleep 6hrs is fine since her weight is on track… but the doctor also said she should be more hungry during the day but she doesn’t seem to have an increased appetite.. anyone have a similar experience?