Final answer:
The average height of full-term infants at birth in the U.S. is 51 cm (20 in.), with a range of 46-56 cm (18-22 in.). The average weight for full-term infants is 3.4 kg (7.5 lb), with a range of 2.5-4.5 kg (5.5-10 lb).
Step-by-step explanation:
The average height and weight of infants at birth in the U.S. can vary, but there are typical ranges. For full-term infants, the average height is between 46 and 56 cm (18 and 22 in.), with an average of 51 cm (20 in.). The average weight for full-term infants is between 2.5 and 4.5 kg (5.5 to 10 lb), with an average of 3.4 kg (7.5 lb).
For pre-term infants, the average height and weight may be lower, as they have had a shorter period of prenatal growth.
These figures can provide a general idea, but it's important to remember that every child is unique and may deviate slightly from these averages.