Babies are extremely flexible.
While it might seem like a magic trick, a baby's flexibility comes down to their unique musculoskeletal structure. Here's a breakdown:
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Cartilage, Not Fully Developed Bones: According to the reference, babies' bones are not fully developed at birth. In fact, bones don't fully develop until our 20s! Instead of fully formed bones, babies have more cartilage. Cartilage is softer and more pliable than bone, contributing to their flexibility.
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Musculoskeletal Structure: Although the bones aren't fully developed, the reference highlights the importance of the "musculoskeletal structure of ligaments, muscles and tendons" in providing this flexibility. This system connects the cartilaginous spine and allows for a greater range of motion.
Essentially, the combination of more cartilage and a flexible musculoskeletal structure allows babies to achieve positions that would be impossible (and painful!) for adults.
