Infant development indicators at each stage

Newborn babies are still relatively unfamiliar with the world and have not fully adapted to this environment, so parents need to take care of them patiently and learn some knowledge about the baby's development at each stage. Now let us learn about some developmental indicators of babies at each stage.

The period from birth to 1 year old. 1 to 3 years old is the early childhood period. Some researchers call them the infancy period and the infant period respectively. The first stage is further divided into the neonatal period.

The period from birth to one year old is the first accelerated period of an individual's physical and mental development. During this stage, not only does the baby's body grow rapidly and gain weight rapidly, but the brain and nervous system also develop rapidly. On this basis, the baby's psychology also undergoes tremendous changes under the influence of external environmental stimuli. They transitioned from breastfeeding to weaning, and learned the unique human way of eating; they developed from lying down and unable to move freely to being able to use their hands to touch and manipulate objects and stand on two legs, and learned to walk independently; they transitioned from not understanding language at all and not being able to speak to being able to use language for the simplest communication, etc. All this indicates that the baby has taken the first step from a natural, biological individual to a social entity. On the basis of their inherited biological nature, they form socialized human nature - sociality, and gradually adapt to human social life.

During the period of 1 to 3 years old, infants' physical and mental development undergo two major changes: 1) They learn to walk independently and accurately play with or manipulate objects with their hands, and on this basis, they engage in the simplest games, learning, self-service and other activities. ② Language developed rapidly, and they were able to use language freely to communicate with others, and could make the most preliminary adjustments to their own behavior and psychological activities through language. This enables babies to adapt to social life better and produce new qualitative changes psychologically.

① The body weight can reach three times that at birth, which is about 9,000 to 10,000 grams. ② The height is about 50 cm at birth, and generally increases by 3 to 3.5 cm per month, 10 to 12 cm at 4 months, and can reach about 1.5 times the height at birth at 1 year old. ③The head circumference is about 34 cm at birth, increases by 8 to 10 cm in the first six months, and 2 to 4 cm in the second six months, reaching an average of 46 cm at one year old. The growth rate slows down afterwards, reaching about 56 to 58 cm in adults. ④ The chest circumference is 1 to 2 cm smaller than the head circumference at birth. By the end of 4 months, the chest circumference is basically the same as the head circumference. ⑤ The baby's brain is still in a period of rapid development for a period of time after birth, and the number of brain nerve cells continues to increase. It needs sufficient, balanced and reasonable support of nutrients (especially high-quality protein), so the demand for calories, protein and other nutrients is particularly strong.

The above article has introduced in detail some developmental indicators of infants at different stages. I believe everyone has a relatively preliminary understanding. Therefore, in daily life, if such abnormal situations occur, parents should find the reasons in time.