In babyhood, most of the weight gain comes from an increase in -

Correct option is C

During babyhood, most weight gain results from an increase in fat in tissue, which serves as an energy reserve and helps regulate body temperature.
Information Booster:
· Babies experience rapid growth, and fat accumulation provides essential energy for development.
· The proportion of fat decreases as the child grows older and engages in more physical activity.
Additional Knowledge:
· Proteins in tissue (a): Important for muscle growth but not the primary source of weight gain in infancy.
· Glycogen in tissue (b): A form of energy storage, but its contribution to weight gain is minimal.
· Haemoglobin in tissue (d): Related to blood oxygen transport, not weight gain.