イヤイヤ期き

noun

terrible twos; phase of toddler defiance

Colloquial term for the developmental stage around age two when toddlers frequently say いや (no) and resist parental instructions. Used mainly in parenting and childcare contexts.

• うちの子こもイヤイヤ期きに入はいって、何なんでも「いや」と言いうようになった。

  Our child has also entered the terrible twos and now says 'no' to everything.

• イヤイヤ期きの対たい応おうに悩なやむ親おやは多おおい。

  Many parents struggle with how to handle the terrible twos.