いやいやき
terrible twos (developmental stage in toddlers)
Also written いやいや期、嫌々期、嫌嫌期
Noun
２〜３歳さいの時ときのイヤイヤ期きは、子こどもが自立じりつする上うえで通とおらなければならない段階だんかいなんです。
The terrible two's is a stage that children between ages two and three must pass in order to become independent.