There is no strict rule on whether or not to shave a newborn’s head at 30 days of age. For newborns with long hair, especially in summer when they tend to sweat easily, they may have dust, dirt, etc. and develop rashes or look dirty, and a hair cut will help with care. Some infants may suffer from seborrheic dermatitis and develop conditions such as tinea capitis, in which case they can have their hair cut, mainly by going to the hospital for treatment. However, if the infant is in an environment that is not hot, has clean hair, and the hair is not very long, it is not necessary to cut the hair on the 30th day, and normal care of the hair in daily life is sufficient to prevent any discomfort of the scalp.