The requirements and steps for children's toy CPC testing include testing chemical substances, mechanical properties, small parts, electrical safety, inhalation, and acoustic performance in toys. Specifically, these tests include:

1. Testing for chemical substances: Detect the content of harmful substances such as lead, cadmium, mercury, etc. in toys to ensure compliance with relevant restrictions.

2. Mechanical performance testing: Testing the strength, stability, and disassembly of toys to ensure that they do not cause harm during normal use.

3. Small parts testing: By detecting and evaluating small parts in toys, it is determined whether they pose a risk of suffocation or swallowing.

4. Electrical safety testing: Testing the electrical performance of electric or electronic toys, checking the safety of batteries, durability of wires, etc.

5. Inhalation testing: Testing various components in toys to ensure they do not cause suffocation or inhalation risks.

6. Acoustic testing: Test the volume of sounding toys to ensure they do not cause harm to children's hearing health.

The specific testing standards will vary depending on the type and purpose of the toy. These are some common standards in CPC testing. In order to be sold in the US market, children's toys must pass CPC certification and meet the requirements of CPC testing standards.

The steps for children's toy CPC testing include:

1. Prepare samples: Select a sufficient number of samples for testing to ensure that they represent the entire product series.

2. Laboratory testing: Send the samples to an approved laboratory for testing, including materials, structure, small parts, tension, pressure, small parts, structure, toxic substances, etc.

3. Write a report: After the test is completed, the laboratory will write a test report, confirm the report information, and sign it.

4. Certificate and report issuance: After passing the test, the certification agency will issue the CPC certificate and upload the test report to the CPSC database for consumers to view.

The above information is for reference only, and the specific CPC testing steps are subject to the actual situation.