How old is a baby, how old is a child, and what is the age of a child?

A baby is a baby from birth to a few months, and a child is a baby who can walk to preschool age.

An infant generally refers to a child under the age of one year, and a child refers to a child who has reached the age of one year, so there is a certain difference between the two.

1 5 years of age belongs to young children, and after 5 years of age belongs to children.

Those under one year old belong to infants, and those over one year old belong to children.

Be at least one year old. It's children. Babies up to 12 months are called.

Infancy: refers to the first year of a child's life, and children during this period are called infants.

Pre-childhood: postnatal period.

The second and third years (2-3 years old), also known as the first pre-school period. Children at this stage are called pre-toddlers or pre-school children.

Early childhood: refers to the age of 3.

Six or seven years old. This period is the period before children enter school, so it is also called pre-school. Children in this period are called toddlers or preschoolers.

The age group of each kindergarten class is divided into: small class: 3---4 years old, middle class:

4---5 years old, kindergarten years old.

How old a child is a baby.

An infant is a child less than 1 year old. Babies grow and develop very rapidly at this stage, and are the most vigorous stage of growth and development in a person's life, weighing about 9,000 to 10,000 grams.

What are the characteristics of a baby.

1. The weight can reach 3 times that of birth, about 9000 10000 grams.

2. The length of the body is about 50 cm at birth, generally grows by 3 cm per month, grows by 10 12 cm at 4 months, and can reach about twice that of birth at the age of 1.

3. The head circumference is about 34 cm at birth, increasing by 8 10 cm in the first half of the year, 2 4 cm in the second half of the year, and an average of 46 cm at the age of 1. After that, the growth rate slowed down, and by the time of adulthood it was about 56-58 cm.

4. The chest circumference is 1 2 cm smaller than the head circumference at birth, and by the end of the baby's 4 months, the chest circumference is basically the same as the head circumference.

5. The baby is still in the period of rapid development of the brain for a period of time after birth, and the number of brain nerve cells continues to increase, which needs the support of sufficient, balanced and reasonable nutrients (especially high-quality protein), so the demand for calories, protein and other nutrients is particularly strong.

Under the age of 3 is called an infant.

Refers to young children aged 0-6 years. 0-3 years old is infant, 3-6 years old is toddler, and the two together are referred to as infants.

In the first year of life, babies grow and develop rapidly, with the fastest growth in weight and length, which is the first growth peak. At the end of March, the body weight can reach twice (6 kg) at birth, which is almost equal to the increase in the last 9 months, and at 1 year old it has increased to 3 times the birth weight; The height has increased by 25cm. The head circumference increased from an average of 34 cm to 46 cm at birth.

Because its digestive function is not yet mature, if it is not fed properly and the nutrient supply is insufficient, it is prone to nutritional deficiency diseases and backward growth and development, and is prone to digestive disorders, diarrhea and other diseases.

3-4-year-old children's body organs and systems are in the process of continuous development, their body tissues are relatively soft, not mature enough, the function is perfect, the body is susceptible to injury, and it is easy to be infected with diseases. There are obvious individual differences in the growth and development of young children.

4-5-year-old children have rapid gross motor development, obvious leaps in motor development, muscle strength and endurance, myocardial contraction ability, and lung capacity have been improved.

The inhibition process of the brain of 5-6-year-old children is gradually strengthened, the impulsivity is reduced, and the purpose of action and self-control ability are gradually improved.

Hello, infants and toddlers actually consist of two stages, that is, they are composed of two stages: infancy and early childhood. The nascent period is from 28 days after birth to 1 year of infancy, 1 to 3 years of age for early childhood, 3 to 6 years of age for preschool, and after 6 years to before the onset of puberty. Therefore, the so-called infancy and toddler period refers to the age group from after the full moon to before the age of three.

0-3 years old are collectively referred to as infants and toddlers.

Internationally, children aged 0 to 14 are generally defined as children, while the Chinese national standard refers to children at the age of 0 6.

Children's growth and development is a continuous process, and there is no obvious boundary in between, but in order to distinguish the characteristics of different age stages, children are artificially divided into the following stages in medicine: children are usually divided into different stages such as newborn (0 28 days), infants (29 days and 1 year), toddlers (1 3 years old), preschool children (3 6 years old), adolescents (12 and 18 years old) and so on.

In the field of education, the definition of a child also varies. Usually 0 3 years old is defined as early childhood, 3 6 years old as early childhood, 6 12 years as children, and 12 18 years as adolescents.

In the field of law, the definition of a child varies slightly from country to country. Under Chinese law, people under the age of 18 are considered minors, while in the United States, people over the age of 18 are considered adults.

Children's growth process:

No matter what kind of field is defined, children are immature, ignorant, simple, in the process of respecting their growth, family and education are very important influencing factors, family is the most important growth environment for children, parents' words and deeds and education methods have a profound impact on children's growth. With the help of external education, children can gradually establish their own worldview, outlook on life and values.

Children's development requires attention and care. Childhood is the most precious period of life, a time of hope and infinite possibilities as children now learn, grow and shape their future. It is everyone's responsibility to encourage children to grow up healthily and to create a safe, healthy, loving and caring environment for children.