Normal pregnancy lasts from 37 to 42 weeks, on average 40 weeks. The child who was born in this period is considered a full-term baby. Date of labors normally comes in 280-282 days after the first day of the last menses. Date of labors generally is defined at ultrasonic examination of a fetus. At the same time, it can differ for several days from the calculated date of the last menses. Weight at the birth can strongly differ and it is normal. The full-term child weighs from 2,5 to 4,5 kg, the average weight is from 3,5 to 3,6 kg. Average height is 50-51 cm.
If labors happen until 37th week (259 days), then, according to the definition of the World Health Organization (WHO), the child is considered prematurely born. A prematurity also means that the child is unripe, is born before the termination of the put term of fetal development.
Prematurely born children – are the children who were born in terms from 22 to 37 weeks of fetal development and have the body weight over 500 g and length over 25.