Ishchite mamu (2013)

Igor receives an unusual present on his wedding day when a baby is left on his doorstep. The anonymous note states that the baby is his son, and he must take care of him. Not surprisingly, Igor's wedding is cancelled, and he begins his new life as a single dad. He tries to find the baby's mother and traces four women with whom he had had brief affairs. However, when none of them admits to being the baby's mother, Igor begins to wonder just whose son little Andrey really is.