1. Characteristics of development ①Great movements: starting from 3 months of age, the baby has a purposeful movement, after 1 month of age when the characteristic reflex activities gradually disappeared. Head erect for a longer time, sometimes can turn the head to look around. Prone head can be raised, two wrists can support the upper limbs, and can even lift the chest. When lying down, the child can automatically turn from the supine position to the lateral position. ②Fine motor skills: when waking up, they can wave their little hands, and gradually they can suck their hands for a long time. Sometimes they can look at their own fingers and touch their hands together. Seeing objects, they would move their arms in an attempt to touch the toys. When holding a toy in his hand, he would put it into his mouth to explore. ③Visual development: Visual sensitivity is more acute than at 2 months of age. ④Auditory development: Hearing is more sensitive than at 2 months of age. ⑤Language development: baby can make fun, laugh out loud, and make sounds such as “ah” and “wow” to communicate with others. ⑥Social interaction: babies know likes and dislikes. Hungry, pain when the baby cried loudly, full, satisfied and comfortable when the hands and feet, full of joy. 2, the ability to train ① prone chest: the baby’s motor development is continuous, after he can prone head up 45 °, neck muscle tone, the strength of the arms will gradually increase, he will be prone in the head up and 90 ° with the bed, the head can remain stable. Following the baby’s forearms can support the head, but also support the shoulders, chest are raised, head stable and can freely turn to the sides, at this time, parents can use toys in different places to tease him to turn his head to look for. ② Turning over (supine – side): Before 3 months of age, babies mainly lie on their backs and begin to have full-body muscle activity. Be sure not to bundle your baby up like a candle pack, so as not to restrict the baby’s activities, should be in the case of appropriate warmth to allow the baby to move freely. When the baby is in the supine position, parents can use the toys that the baby is interested in to tease him on both sides in front of him, and train him to turn over from the supine position to the side-lying position, and train him for a few minutes in each class, and train him several times a day. 3, cognition, language and interaction ① sight transfer: baby with age, the eyes are getting brighter and brighter, can all of a sudden attention to the toy in front of them, and can be sensitive to follow. You can use 2 toys (or two people) to tease the baby, let him/her gaze at one toy (or person) first, and then take out another toy (or person), to train the baby’s sight to shift from one object to another. You can also quickly move away from an object or a person’s face when the baby is concentrating on it, and train the baby to look for it visually when the object of attention disappears. ②Teach your child while breastfeeding: Early education is combined with daily life. Most babies are awake when they are breastfeeding, and mothers should take advantage of this time to communicate with their babies. Before feeding, you can say “baby hungry? Mommy will feed you milk to eat” and so on. Feeding, you can touch the baby’s hands, legs and head, etc., hum some songs to the baby. When the baby is full, you should also talk to the baby. Say what you want to say, to promote the development of the baby’s ability and the exchange of mother and child feelings. ③Create a good environment: the air should be fresh, try to open the window to ventilate. In summer, turn on the air conditioner, the temperature is 25-28 ℃; in winter, the room temperature is 18-22 ℃ is appropriate. Indoor clean, warm environment, toys should be regularly changing patterns and changing positions, often play beautiful music or children’s music, appropriate volume, time 30-60 minutes. Avoid noise. Outdoor activities should now be fresh air, green plants, less people, so that the baby for air and sunbathing. ④Playing toys: put the toys in front of the baby’s chest 20 centimeters, shake or rattle the toys to attract the baby’s attention, and tease the baby to pat, reach, grasp, and touch the toys; you can also hang the toys with rattles on the top of the feet, within the baby’s line of sight, to tease the baby to stir up with his legs. ⑤Language: the pronunciation of babies at this age will gradually increase, should be in the baby’s mood when the baby is happy more with the baby to talk and laugh, tease the baby to pronounce the words, the personnel at home should be more and the baby to talk to the baby, so that it can feel a variety of voices and intonation, to promote the baby’s ability to perceive the language. (6) Life and interaction: Strengthening baby’s laughter can promote his/her physical and mental health, and facilitate physical growth and early cognitive development. Teach babies to recognize their mothers and fathers and cultivate parent-child bonding. You can train your baby in various ways when he/she is awakening. 4, abnormal signals: face-to-face teasing, 3-month-old baby will not smile; lying position can not raise his head more than 45 °; will not babble sound; supine position, head and eyes can not be horizontal after the toy to move 180 °. The above situation, it is recommended to strengthen the training at the same time to find a professional examination.