4 to 6 months infants eating and sleeping to begin to establish a regularity, because this period of time the child’s ability to begin to enhance the activity, the emergence of stretching, stirrups four limbs jumping activities. So mothers should also begin to teach the baby to learn the skills. For example: grasping, rolling over, sitting, and even crawling. In addition, babies can express their emotions. The baby recognizes the birth and begins to attach to the mother, and his personality traits become stronger. So it is important for mothers to be fully aware of their child’s developmental characteristics during this period.