Just like 復旧 (past events)

旧 means ex- or old times:  It's stuff before the current day, like the line is left of day here.
児, newborn:  A living thing (with legs) that was born yesterday.
稲, rice plant:  Per Henshall, the 旧 is a corruption of something like 臼, mortar -- the rice is pressed by hand into the mortar to be ground.

旧児稲