Examples of using "трёхлетняя" in a sentence and their english translations:
Tom has a three-year-old daughter.
Tom has a wife and a three-year-old daughter.
My three-year-old niece kissed me on the cheek.
My three-year-old niece kissed me on the cheek.
My three-year-old daughter asked me to take her to the park.
It's like a two-year-old, three-year-old, same age, little girl,