Authorised ID card for entry into airport

This notification from the Bureau of Civil Aviation Security says:

3. There shall not be any requirement of identity proof in respect of Infant/Minor accompanied by their parents/guardian who is a bonafide passenger having a valid identity proof as listed above. However, an unaccompanied minor shall be required to produce a valid identity proof as listed above.

If you accompany the child, it looks like they won't need an ID card for entering the airport. It also says:

4. In case of a passenger who for some valid reasons is not in a position to produce any of the above-listed photo identity proofs, the Identity Certificate issued by a Group' A' Gazetted Officer of the Central/State Government on his official letterhead with passenger's photograph duly attested will be valid for this purpose.

The list of acceptable identity proofs (given in item (2)) is:

1. Passport;
2. Voter Photo Identity card issued by Election Commission of India;
3. Aadhaar or m-Aadhaar issued by Unique Identification Authority of India (UIDAI);
4. PAN Card issued by Income Tax Department;
5. Driving License issued by RTO;
6. Service Photo Identity Card issued by State/Central Government, Public Sector Undertakings, local bodies or Public Limited Companies;
7. Student Photo Identity Cards issued by Government Institutions/Government recognized Educational Institutions;
8. Nationalized Bank Passbook with attested Photograph;
9. Pension card / Pension documents having photograph of the passenger;
10. Disability Photo ID Card/handicapped medical certificate issued by the respective State/UT Governments/Administrations