How often did you bathe your newborn? Do you need to wash their hair with shampoo at each bath time?

Newborn hardly gets dirty so bathing once a day should suffice. More attention should be paid to areas with creases (such as armpits, groins, back of knee) as these are where dirt may gather. My sister-in-law use shampoo/soap suitable for babies when my niece and nephew were newborns. But she only uses a small amount just to make sure that babies were clean and comfortable.