As far as I know, for the medical expenses of poor children, you can apply to the Guangzhou Women and Children Medical Center for the poverty fund to subsidize them. The specific steps to fill in the application form for poverty alleviation funds are as follows:

1. Applicant information: Fill in the personal information of the applicant such as name, gender, date of birth, address, contact number, etc. on the form.

2. Family information: fill in information such as family population, family members' relationship, occupation, etc., including the names, ages and work conditions of parents and other family members.

3. Financial status: provide the financial status of the family, including family income, expenditure, housing and vehicles. When filling in, you need to provide detailed financial documents, such as payroll, bank passbook, transportation expenses, etc.

4. Disease status: fill in the disease diagnosis and treatment status of children who have applied for funding. Including the name of the disease, the date of admission, and the progress of treatment.

5. Poverty proof: provide relevant poverty proof documents, such as poor household certificate, low-income household certificate, medical assistance certificate, etc. These materials can prove the poverty of families and their need for economic assistance.

After completing the application form, remember to attach all necessary supporting documents and submit the application form and related documents to the relevant departments of Guangzhou Women and Children Medical Center within the specified time. They will evaluate the application and make a funding decision according to the actual situation.

It should be noted that the application process and requirements of different medical institutions may be different. It is suggested that you contact the relevant departments of Guangzhou Women and Children Medical Center to understand their specific requirements and procedures before filling out the poverty fund application form.