Height and weight of a one and a half year old girl

When a girl reaches one and a half years old, her height and weight can reach two or three times that of when she was born. Parents should take better care of their babies, especially in terms of diet. They must pay attention to diversity, so that their babies can take in a variety of nutrients and avoid malnutrition. They should also do more exercise, which can also promote development.

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. It increases by 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.

1. Height is related to genetics

According to research, 75% of a person's final height is determined by genetic factors. That is to say, in general, if parents are tall, their children will also be tall; if parents are short, their children will also be short. However, parents' height is not the only factor that affects their children's height. External factors, namely environmental conditions, also have an impact on height that cannot be ignored. External factors mainly refer to nutrition, living habits, physical exercise and whether one is ill.

2. Height is related to nutrition

In a sense, height is "built up" of nutrients (especially protein). There are 50,000 to 100,000 kinds of proteins that make up the human body, and the eight essential amino acids that make up these proteins must be supplied by food. If food can provide sufficient amounts of the eight essential amino acids, it can accelerate protein synthesis and help the growth and development of tissues and organs throughout the body, especially the growth and development of bones and cartilage. Bones, especially the lower limbs and spine, have the most active metabolism during the period of physical development and require adequate nutrition supply.

3. Height is related to sleep

When biologists studied the secretion patterns of endocrine glands, they found that for children and teenagers, good sleep will help them grow taller. The growth of height depends on the continuous growth of the epiphysis, and the growth of the epiphysis is controlled by the endocrine glands. The endocrine hormones that control height mainly include growth hormone, luteinizing hormone and sex hormones secreted by the pituitary gland, among which growth hormone has the most significant effect. The secretion of growth hormone has its obvious regularity, that is, it is secreted less during the day and more at night when sleeping.

When children fall into deep sleep for one hour, the secretion of growth hormone is 5 to 7 times more than that during the day. The secretion of sex hormones and luteinizing hormone is also very strong during deep sleep, which can thicken bones and strengthen bone quality. Obviously, this is very beneficial to children's height growth.