Baby’s Unstable Nighttime Sleep

A four-month-old baby is experiencing unstable nighttime sleep, waking up every hour or so, with restless movements and head-scratching. The baby sleeps from 8 pm to midnight, requiring to be woken up for a diaper change. Why does the baby become restless in the latter half of the night? Could it be due to a calcium deficiency? How should a child so young be supplemented with calcium?
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