Final answer:
We would expect a 2-year-old girl to gain about 4 to 6 pounds per year and grow roughly 2 to 3 inches per year through early childhood, considering average growth patterns for preschoolers.
Step-by-step explanation:
If Rania is a 2-year-old girl and she develops at an average rate, through early childhood we would expect her to gain approximately 4 to 6 pounds (1.8 to 2.7 kg) per year and grow about 2 to 3 inches (5.1 to 7.6 cm) per year. This is considering the typical growth patterns during the preschool years, which are considered to continue from toddlerhood.
It should be noted that during infancy, growth is rapid with the body weight likely to quadruple from birth weight by the time a child reaches 2 years old, and height increases significantly as well. However, after this, the rate of growth slows down.
By age three, considering a 52 percent increase in weight from age one, if Rania weighed 20 pounds at one year, we could expect her to weigh around 30 pounds (by adding approximately 10 pounds). For height, with an approximate 26 percent increase from age one to age three, if Rania was 29.5 inches tall at one year, we could estimate her to be about 37 inches tall by age three.