Final answer:
In middle childhood, girls show an earlier growth spurt than boys.
Step-by-step explanation:
In middle childhood, girls show an earlier growth spurt than boys. The growth spurt in girls typically starts between the ages of nine and ten, while boys usually begin their growth spurt between the ages of 11 and 12. Girls also have a shorter growth spurt and do not grow as fast as boys during this period. By the time they reach their final adult height, girls are, on average, about 10 centimeters (about 4 inches) shorter than boys.