According to US Baby experts:

A baby’s skin development has not yet completed and the skin is only 1/10 thick of the mature skin. There is only a natural acid layer on skin surface to protect the skin from being infected by bacteria and keep the skin soft and smooth. Therefore, the skin care is of special importance. US Baby experts recommend moms not to use alkaline washing products containing soap, alcohol and irritating ingredients so as to avoid damage to the protection layer. The mild washing products with neutral ph can effectively care the baby’s skin protection layer and keep moisture lastingly.