When choosing an automatic waterproof cover children's umbrella, there are several factors that you should consider. Here are some tips to help you choose the right umbrella for your child:

1. Size and Weight: Choose an umbrella that is lightweight and easy for your child to carry around. The size of the umbrella should also be appropriate for your child's size and age.

2. Automatic Open and Close: Look for an umbrella that is easy for your child to open and close, preferably with an automatic mechanism. This will make it easier for your child to use the umbrella independently.
   

3. Waterproof and Windproof: Look for an umbrella that is both waterproof and windproof. This will ensure that your child stays dry and protected in all weather conditions.

4. Durability: Choose an umbrella that is made of durable materials that can withstand the wear and tear of regular use.

5. Design: Choose an umbrella that is fun and appealing to your child. This will encourage them to use the umbrella and make it a part of their daily routine.

6. Safety: Look for an umbrella that has safety features such as rounded tips and non-slip handles to prevent accidents and ensure your child's safety.

By considering these factors, you can choose an automatic waterproof cover children's umbrella that is both practical and fun for your child to use.