The head lag test is an important tool that healthcare providers use to assess whether a baby is developing within the normal range. By 4 months of age, most babies can hold their head steady when slowly pulled up from a supine position. This is due to the activation of the baby’s ‘head righting reflex,’ which engages the deep neck flexors to help stabilize the head in a chin-tucked position. However, the head lag test should only be used for assessment purposes, as it is not intended to functio

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