How much milk to feed a one week old baby?
Is 90 ml too much? My nanny is feeding this amount
Is 90 ml too much? My nanny is feeding this amount

Yes it is. You can give 60 mL first and see if LO can finish and does not make a fuss. Only when LO seems to still want more then you can top up 30 mL but do not force LO to finish.
