The newborn startle reflex is a normal phenomenon, related to the incomplete development of the cerebral cortex.

The sudden stretching and shaking of a two-month-old baby’s limbs may be a startle reflex or related to a lack of calcium or vitamin D. It is recommended to conduct tests for electrolytes and vitamin D levels, and to provide supplements or treatment based on the results. Additionally, a dynamic electroencephalogram should be performed to rule out other possibilities.

Babies may wake up during sleep due to calcium deficiency or a startle reflex. It is recommended to undergo trace element testing for a diagnosis and to start symptomatic treatment.