What is the normal weight proportion of muscles at birth?

At birth, the normal weight proportion of muscles is approximately 1/4 of the total body weight. This means that if a newborn weighs 8 pounds, the muscle mass would roughly account for 2 pounds. This proportion reflects the development of muscle tissue in infants, which, although less developed than that of older children and adults, still forms a significant part of their overall body weight.

The proportion of muscle mass as a fraction of body weight increases as the child grows, due to the various stages of physical development, diet, and activity. This value is key in understanding infant development, as it provides insights into their growth patterns and health parameters.

The other options do not accurately represent the typical muscle mass proportion found in newborns. The fractions mentioned either underestimate or overestimate the muscle contribution relative to an infant's total body weight. Understanding this helps health professionals assess growth and health during the early stages of life.