Dictionary / Vocabulary / イヤイヤ期
いやいやき
terrible twos (developmental stage in toddlers)
Also written いやいや期、嫌々期、嫌嫌期
２〜３歳の時のイヤイヤ期は、子どもが自立する上で通らなければならない段階なんです。
The terrible two's is a stage that children between ages two and three must pass in order to become independent.