Clinically there is no obvious fierce long term statement, the folk put the baby 0-3 months, the growth and development of fast stage called fierce long term, the baby will mainly appear to increase appetite obviously, height and weight increase performance. 1. Appetite increased significantly: the baby’s appetite will increase significantly after entering the fierce long-term, if the amount of food provided by parents did not increase, the baby will cry because of hunger. 2. Increase in height and weight: Babies in the Masturbation Period will have a significant increase in height and weight during this period, and their weight can double from birth to 3 months of age. From birth to 1 year old, the length of the baby can increase by 25cm. For babies under 3 months old, parents can feed them on demand. In addition, they can visit the Child Health Unit of the hospital on a regular basis to improve the physical examination and growth and development assessment, and if there are any abnormalities, early intervention can be made to deal with them.