Answer :
Final answer:
The average length of a fully developed newborn baby is about 20 inches or 51 cm. This is the standard length for a healthy, full-term infant, and typically newborns can double this length by their first birthday.
Explanation:
Average Newborn Length
The average length of a fully developed newborn baby is typically around 20 inches or approximately 51 centimeters. This measurement is considered the standard for a well-nourished, full-term infant, mainly in wealthier nations where medical care and nutrition during pregnancy are more accessible. The data indicates that the normal range for a full-term newborn's length at birth is between 46 and 56 cm (18 and 22 inches), with a common average of 51 cm (20 inches). Additionally, the birth weight for a healthy newborn ranges from 2.5 to 4.5 kg (5.5 to 10 lb), with an average at about 3.4 kg (7.5 lb).
For pre-term infants, the numbers are expected to be lower due to a shorter period of prenatal growth. However, shortly after birth, infants typically go through a period of rapid growth where a healthy infant can double its length by its first birthday. Therefore, when considering the length of a newborn baby, option b) 20 inches is the most accurate answer.
