My nanny also taught to put a little bit,like 4 drops of soap, to the tub of water,and use it for both hair and body. but honestly tt doesn't get my baby's hair clean, and got smell lol. so now I shampoo his hair with a tiny squirt of the hair and body wash, then rinse off with water,before putting baby into the bathtub. bath water has another small squirt of soap, and I don't rinse off.