India's population is expected to reach 1,425,775,850 people by the end of April, the new data shows.
A different UN body last week predicted that India would overtake China by the middle of this year.
The Asian nations have accounted for more than a third of the global population for over 70 years.
"China will soon cede its long-held status as the world's most populous country," the UN's Department of Economic and Social Affairs (DESA) said in a statement.
