应该是 tow years old或tow_year old
Happy birthday to the baby in two-year-old.
Happy two-year-old birthday!
你列举的是序数词的写法，分别是：1st,, 2nd,,, 3rd... 4th... 5th... 6th... 7th.... 8th....9th...10th
Happy birthday to the two-year-old child！
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猴子kami
