魔の３週目
まのさんしゅうめ Expression- 1the dreaded 3rd week (in the life of a newborn; when some previously quiet babies suddenly turn colic) Translated by Jiyomi
Other writings and readings
魔の三週目
expressions (phrases, clauses, etc.) · noun (common) (futsuumeishi)
JMdict entry 2857283. Source and licence.