When children stretch depends on the specific situation. Generally speaking, children need to stretch before physical activity or exercise to reduce muscle stiffness, increase muscle elasticity and improve sports performance. But at the same time, we need to pay attention to the details, and don't stretch too much or too hard to avoid muscle and joint damage. Here are some stretching techniques for different occasions:

1. After warm-up: After some short, mild exercise warm-up, you can do low-intensity stretching, about 5- 10 minutes.

2. After exercise: After a long period of high-intensity exercise, you can do aerobic stretching for 30 minutes to 1 hour to help muscles recover.

3. Every day: Children can do a small amount of static stretching every day, and don't overstretch, which helps to increase muscle elasticity and prevent some chronic injuries in sports or daily activities.

It should be noted that the stretching of children is best carried out under the guidance of family members or trainers, and should be planned reasonably according to the actual situation and physical condition of children.