Final answer:
The typical height for a 12-month-old is closest to 30 inches, based on average growth patterns where a well-nourished and healthy infant is expected to reach about 29.5 inches by that age.
Step-by-step explanation:
The typical height for a 12-month-old, according to the given information, is around 29.5 inches. This is based on the data from the WHO Multicentre Growth Reference Study Group (2006) that states the average length of a newborn is 19.5 inches, increasing to 29.5 inches by 12 months. Therefore, the correct answer among the provided options is 3) 30 inches. Growth in the first year is very rapid, and while there might be variability depending on genetics and environmental factors, a well-nourished and healthy toddler generally reaches close to double their birth length by their first birthday.