Here's what Speiser says:
(_Genesis: Introduction, Translation, and Notes_ by E.A. Speiser [The Anchor
Bible, vol. 1], 1964)
In Semitic (notably in Akkadian, cf. Gilg., Tablet XI, lines 215ff.) the
normal ordinal series is "one, second, third," etc., not "first, second,
third,"
etc.; cf. also ii 11.