I bought social security in Dongguan for three months the year before last, stopped for half a year, and then continued to buy it in Guangzhou. Can Guangzhou maternity insurance be accumulated?

Social security is paid cumulatively, and it is broken in the middle. If the payment base meets the requirements, it will not affect the rights and interests of the insured, but the maternity insurance allowance cannot be interrupted midway and needs to be paid continuously for one year.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.