At the airport, a family with a little girl (she has a doll in a baby carrier) and a man with a child (in the same carrier) confused the doll with a child. The man went with the doll to his country, and the family took the child with them instead of the doll. Then the whole movie they were looking for each other to swap.
It’s a park, not an airport, but
Hope & Faith s2e8 The Dolly Mama
https://www.imdb.com/title/tt0604849/