Final answer:
Yes, the proportions of a child's body are very different from those of an adult; notably, a newborn's head size is much larger relative to their body compared to an adult.
Step-by-step explanation:
The statement that the proportions of a child's body are very different from those of an adult is true. During development from infancy to adulthood, body proportions change significantly. This is evident when considering the size of the head in relation to the body.
For a newborn, the head constitutes about one-quarter of the total body length. In contrast, an adult's head is only about one-seventh of their total body height. The reason for drawing the human figure at various ages all the same size, as shown in Figure 23.5.5, is to clearly illustrate the differences in body proportions, especially the head size.