Since 7-month-old babies are completely incapable of self-care, they should be helped by their parents throughout the entire process. Let the little one lie on his or her back in the parent’s arms, and gently rub the baby’s hair with a non-irritating shampoo. 1. Prepare baby shampoo, a towel and set the water temperature at 38-40℃ before washing baby’s hair. 2. Let the little baby lie on his back in the arms of the parent, who clamps the body of the little baby with his left arm and holds the back of the baby’s head with the palm of his left hand. 3. Cover the baby’s ears with the thumb and forefinger of the left hand to prevent the bath water from entering the ear canal, and then wash the hair with a small, soaked towel. 4. Pour baby-specific, non-irritating shampoo on your hand and gently rub it on your baby’s head. 5. Dry the baby’s head with a towel after washing to avoid catching a cold. It is recommended that parents in the hot summer weather can give the baby wash his hair once a day, but it is not recommended to use shampoo every day, 2 to 3 times a week, the rest of the time with water, other seasons 2 to 3 times a week to wash the hair is appropriate.