No need to give water to bb cos they get water from milk and it should be enough.
"用米水/薏米水開奶" - the former can make bb feel more filled and probably delay the 'hungry time' (but may make bb drink less milk, usu. used for stopping/delaying night milk/meal only) while the latter can make bb less 'hot'. For the latter purpose (making bb less hot), or you can use 'hoi nine cha' (a pack of chinese medicine specially prepared for babies, available in most chinese pharmacies or 'wai yuen tong', 'dong fong hung', 'yu yan sung' (hope you understand my 'ping ying' cos I'm not good in typing Chinese). Very useful for my case.