2 We report 2 jittery newborns with the only biochemical abnormality being vitamin D deficiency. ![]() ![]() Vitamin D deficiency has not been historically included in the differential of such movements however, vitamin D deficiency is common in pregnant women (5% to 50%) and in breastfed infants (10% to 56%), despite the widespread use of prenatal vitamins, because these may be inadequate to maintain normal vitamin D levels (≥32 ng/mL). Regardless of the term used, if repetitive and recurrent, such movements in the newborn period typically precipitate a search for the etiology among possibilities, such as hypoglycemia, hypocalcemia, hypothermia, hyperthyroidism, hypomagnesemia, drug withdrawal, sepsis, seizure, or neurologic disorder. A shiver is described as a momentary trembling movement. Meriam-Webster’s dictionary describes a shudder as the act of trembling convulsively or shaking because of fear or cold. 1 Shudders and shivers have a more colloquial usage. A fine tremor is of high frequency (>6 cycles per second) and low amplitude (6 cycles per second) and high amplitude (>3 cm). Tremors are involuntary, rhythmic, oscillatory movements of equal amplitude. ![]() Jittery is a term used to describe a series of recurrent tremors in infants. These terms, although used interchangeably, are defined variably, depending on the author. Shudders, shivers, jitteriness, and tremors are terms used to describe excessive movements in neonates.
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