Because my three year-old daughter has a small head, I thought I wouldn't be able to find goggles that would fit her. But she was introduced to these goggles at her swimming school and immediately started feeling more comfortable putting her face in the water (something she would *never* do before). After I bought these goggles and we practiced at home in the bath, she's going under water with abandon and the goggles fit her head well and keep the water out of her eyes.