Fetal period
It takes about 280 days from the combination of eggs and sperm to birth.
Neonatal period
From umbilical cord ligation to 28 days after birth.
initial stage
28 days to one year after birth, also known as lactation.
initial stage
1 to 3 years old.
From preschool.
After the age of 3, I went to primary school at the age of 6 ~ 7.
school age
6 ~ 7 years old to female 12 years old, male 13 years old.
salad days
Girls are from 1 1 ~ 12 to18, and boys are from 13 ~ 14 to 18 ~ 20.