1. material: choose materials with good thermal performance, such as wool, down, alpaca hair, etc. At the same time, we should pay attention to the material to avoid pilling and hair loss.

2. Thickness: Select the appropriate thickness according to the local temperature and season. Generally speaking, seven-year-old children can choose warm clothes with a thickness of about 100g.

3. Size: Choose the right size, not too tight or too loose, so as not to affect children's activities and warmth.

4. Design: You can choose some cute patterns or prints that children like to wear. At the same time, we should pay attention to the safety of the design and avoid too many items that are easy to hurt children, such as buttons and zippers.

5. Brand: Choose products of well-known brands, with guaranteed quality and better after-sales service.