After eight months of age, babies are more athletic and appear more active, parents should pay attention to watch their babies to avoid accidents. 1, boy growth and development standards: height (cm) 63.9-78.9 average 71.2; weight (kg) 6.46-12.60 average 9.05; head circumference (cm) 41.0-48.9 average 44.8. girl growth and development standards: height (cm) 62.5-77.3 average 69.6; weight (kg) 6.13-11.80 average 8.41; head circumference (cm) 40.1-47.7 average 43.6. 2, motor development standards: 8-month-old baby can sit, sit up without support, sit very steadily, can sit alone for a few minutes, can turn the upper body, will not let themselves fall over. 8-month-old baby can crawl, and after the baby’s limbs are very well coordinated, he can stand up and crawl on his hands and knees, head and neck lift, chest and abdomen leave the bed. 8-month-old baby can crawl, and after the baby’s limbs are very well coordinated, he can stand up and crawl on his hands and knees, head and neck lift, chest and abdomen leave the bed. 8 months old baby can roll over, as the trunk muscles gradually strengthen, can turn over at will. Hand skill development standards: at this time the baby can already complete to hold, pinch objects and other actions. 3, language development standards: make “mom” or “bye” and other sounds, at this time he does not understand the meaning of these words, and can not really connect with their own father, mother. During this period, baby’s vocalization becomes active and pronunciation increases significantly. When he is well fed and sleepy, he will often take the initiative to pronounce the vowel and rhyme sounds in succession, and there are continuous syllables, such as “a-ba-ba” and “da-da-da”. 4. Listening ability: Infants can understand some of their parents’ semantics. For example, “it’s time to eat”, “it’s time to drink milk”, “it’s time to pee”, etc. Listening helps infants learn language by linking these words to actual actions and by beginning to remember and imitate language. Listening is essential for language learning. From this time onward, infants can form the first speech-action conditioned reflexes, such as when a child comes to the house and the mother says “welcome, welcome”, the infant will clap his hands. When the father goes to work and says “goodbye to the father”, the infant raises his arms and waves his hands. With this conditioned reflex, infants have the ability to learn to interact with others. (1) Remembering what they see: Infants’ ability to see is further enhanced, and their ability to remember what they see can be fully reflected. (2) purposeful seeing: the ability to see things in the outside world with a purpose. The infant no longer looks at what is available in a general way, but selectively looks at what he likes to see, such as cars running on the road, children at play, and small animals. (3) Beginning of color recognition: As the ability to recognize colors increases, the mother must continue to teach the child to recognize various colors. (4) Beginning of gender awareness: Although they can’t express it, they have a preliminary understanding of gender through their parents’ awareness. Children who are always held and played by their father like to be held by men who are about the same age as their father. Children whose mothers hold a lot like to be held by women who are about the same age as their mothers.