When babies are teething, their gums get sore and they get grumpy.
When babies' teeth are coming in, their gums start to hurt so they become irritable.
ーWhen babies are teething, their gums get sore and they get grumpy.
「赤ちゃんは歯が生えてきている時、歯茎が痛くなってぐずる」
teething で「乳歯が生えること」
gums で「歯茎」
to get sore で「痛む」
to get grumpy で「不機嫌になる」
ーWhen babies' teeth are coming in, their gums start to hurt so they become irritable.
「赤ちゃんは歯が生えてくる時、歯茎が痛み始めるのでぐずる」
to come in で「生える」
to start to hurt で「痛み始める」
to become irritable で「怒りっぽくなる・イライラする」
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カナダ 
