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1. Of or pertaining to the period of time immediately following birth, or to the newborn. (

2. of, relating to, or affecting the newborn and especially the human infant during the first month after birth. (

3. (Pediatrics) Pertaining to the first four weeks after birth. (

Word origin: From Greek neo-, comb. form of neos “new, young, youthful; fresh, strange; lately, just now,” + from Latin natalis “pertaining to birth or origin,” from natus, past participle of nasci “to be born.”

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