Alex was just a few weeks old when Daria first noticed a habit that seemed unusual for a newborn. After finishing a feeding, she laid Alex gently on the bed. Almost immediately, he curled up tightly, tucking his knees under his chest, his arms beneath him, and pressed his face into the mattress. At first, it seemed like a typical newborn quirk—a tiny form of self-soothing—but over time, it became a pattern that concerned her. Daria recorded a video and showed it to her husband, Simon, joking that their son was “playing hide-and-seek.” But when she watched the footage later...
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