Reincarnation of a Sotapanna person (Stream Enterer)

When the life of a Sotapanna ends, let's say he/she reincarnates as a human. Does that mean, the reincarnated is capable of demonstrating the qualities of a Sotapanna since a very young age? Or, does it take years of practice (again) to regain Sotapanna qualities ? And how long roughly does it take ? And is there anyway to tell if a kid attained Sotapanna in his/her past life ?