It is normal for a baby to weigh 5. 1 kg at birth. When a child is born, the normal weight range is 5-8 kg, and 6 kg is ideal. If the child weighs less than 5 kg, most of them are premature babies, that is, babies born before 37 weeks of pregnancy.
Usually, babies born at 28-37 weeks of pregnancy are very weak, with a relatively low weight, generally less than 5 kilograms. The lungs are not yet mature and may not be able to breathe spontaneously. They need to live in an incubator first. The survival rate of premature infants is closely related to their birth weight. The lighter the birth weight, the lower the chance of survival.
The baby is about 6 kg at birth, which is the most reasonable weight, indicating that the child is developing well in the mother's body. Newborns' brain maturity is also ideal, and their physical functions are up to standard. If the fetus weighs about 6 kg, it can pass through the birth canal smoothly. When pregnant, women should control their diet and weight, so as not to make the fetus overweight and affect production.