How Tall Is a Newborn Baby? Average Length Compared

Adult male foot (US size 10.5) 279mm × 102mm 0.56× of Newborn baby (avg. 50cm)
12-inch ruler 305mm × 30mm × 3mm 0.61× of Newborn baby (avg. 50cm)
A3 paper 420mm × 297mm × 0.1mm 0.84× of Newborn baby (avg. 50cm)

Closest match: A3 paper is 0.84× Newborn baby (avg. 50cm).

Quick compare: Adult male foot (US size 10.5) 0.56× · 12-inch ruler 0.61× · A3 paper 0.84×

The average newborn is about 50cm (19.7 inches) long at birth — roughly the length of a sheet of A3 paper.

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