Final answer:
The average weight for a 40-week gestational age newborn is approximately 3.4 kg (7.5 lb).
Step-by-step explanation:
The average weight for a 40-week gestational age newborn is approximately 3.4 kg (7.5 lb). This is considered the average birth weight for a full-term infant. Birth weight is influenced by both fetal growth rate and the length of gestation. Pre-term infants, born before full term, tend to have lower birth weights due to spending less time growing in the uterus.