The National Immigration Institute said the incident occurred over the weekend as a group of migrants was crossing the river near Ciudad Acuna, across from Del Rio, Texas.
The adults did not stop to retrieve the girl and continued across the river.
Papers found in a plastic bag in the girl’s clothing included a birth certificate from Chile, officials said. The girl was part of a family group that had previously sought asylum or refugee status in Mexico.
The girl has been placed with child welfare authorities.
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