寝る子は育つ
Idiom- 1sleep brings up a child well ; a well-slept child is a well-kept child Translated by Jiyomi
Other writings and readings
寝る子はそだつねる子はそだつねる子は育つ寝るこは育つ
expressions (phrases, clauses, etc.) · Godan verb with 'tsu' ending
JMdict entry 2418090. Source and licence.