Douglas Harper's Etymology Dictionary
vagitus
crying of a newborn child, 1650s, from Latin vagitus "a crying, squalling," from vagire (see sough (v.)).
Wiktionary
vagitus
n. The crying of a newborn baby
Usage examples of "vagitus".
The labor is difficult and long, and it may get worse before the vagitus is heard, but don't despair over the Middle East: something great, something wondrous, something completely unimaginable is there aborning.