As any parent can tell you, the person who came up with the line "he|she sleeps like a baby" to mean "deeply and quietly asleep for long periods" didn't have children.
Nor did the marketdroid who came up with "0 - 3 month" sizes for babies. Everybody I know with full-term babies could no more put the "0-3 month" size clothes on their newborn than one can put a hawser through the eye of a needle.
At that time  the chief engineer was almost always the chief test pilot as well. That had the fortunate result of eliminating poor engineering early in aviation.
—Igor Sikorsky, reported in AOPA Pilot
magazine February 2003.