Why is the head of an infant or child more susceptible to injury?

The head of an infant or child is disproportionately larger than the body, which makes it more susceptible to injury. This relative size difference means that the head accounts for a greater portion of their total body mass compared to adults, putting it at a higher risk during falls or impacts. The larger head in proportion to the body can lead to instability, especially in infants and toddlers who are still developing motor skills and coordination.

In addition to being larger, the structure of an infant's skull is not fully developed, with fontanels (soft spots) that provide flexibility but also leave the head vulnerable. As children grow, the body becomes more proportionate, and the risk of head injury decreases. This anatomical feature is critical for caregivers and emergency responders to understand, as it highlights the importance of protective measures during physical activities and when infants or young children are in potentially hazardous environments.