As children grow, the first muscles to develop are the

• A. Small muscles in hands
• B. Facial muscles
• C. Neck muscles
• D. Large muscles of the trunk

Answer: (D)

A key idea here is that growth starts with building a strong core that supports all movement. The large muscles of the trunk provide the foundational stability the body needs to sit, stand, and move. When the trunk is strong, the child has a stable base to control the head, neck, and limbs, which enables rolling, crawling, and eventually walking. Once that core strength is established, the body can then develop finer control of smaller muscle groups, like those in the hands for grasping and manipulating objects, while facial muscles become involved in expressions and feeding as part of later, more complex skills. This progression—from a strong trunk supporting gross motor movement to refined fine motor abilities—explains why the trunk muscles are the first to develop.