It is a normal phenomenon for infants to recognize people and cry, and it is important to avoid separating infants from their caregivers for too long. As infants grow older, the symptoms of recognition and crying will gradually subside. Infants can recognize their parents, grandparents and other caregivers from about 4 to 6 months of age, and may make a smile; 6 to 7 months of age, infants begin to recognize people, strangers may appear to recognize the phenomenon of crying, while their own caregivers are closer, which is a normal phenomenon, this stage should be avoided to avoid too long a period of time to separate infants and their caregivers. If the baby appears to recognize others and cries, you should bring the baby to his or her caregiver as soon as possible; if you can’t bring the baby to his or her caregiver for the time being, you need to be patient with the baby to avoid accidents such as the baby rolling out of the bed alone, and you can use small toys to divert his or her attention. One and a half years old baby can play alone for a while, and grow to 2 ~ 3 years old baby began to like to play with other children, this stage of the baby will not appear special recognition crying performance.