How old is an infant? How old is an infant? What a child

A baby is a baby between birth and 1 year old, that is, a baby within 12 months, this period is called infancy, and it also includes the neonatal period, that is, a baby within 28 days after birth.

Baby in infancy, growth and development is relatively rapid, is the most vigorous stage of growth and development in life, its growth and development has certain characteristics, usually this period of the baby's weight development is faster, length, head circumference growth rate is rapid, weight up to 3 times at birth, length up to birth times, head circumference can increase by about 12cm.

Infancy refers to babies aged 0-1 years.

Generally speaking, we call babies from birth to one year old infants, and the growth and development of babies is very rapid, which is the most vigorous stage of growth and development in a person's life.

Infancy: refers to the baby's 1-3 years old.

Infancy: refers to the period from the birth of the baby to the age of 1 year, usually the infancy period includes the neonatal period;

Early childhood: refers to the age stage of 1-3 years old;

Preschool: refers to the period between the ages of 3 and 6, that is, the period before going to school;

School age: refers to the period between the ages of 6 and 13;

Puberty: refers to the period from the age of 13 to the end of puberty.

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.