Although there is no official confirmation yet, the Redmi M1903C3EC device that has recently been spotted on the website of Chinese certification authority TENAA seems to be the upcoming Redmi 7A handset. Its alleged specs, such as the single 13 MP main camera and the 5.45-inch HD+ display, place it in the low-end sector of the market.
https://www.notebookcheck.net/Alleged-Redmi-7A-hits-TENAA.421253.0.html