In the first scene of season 1 episode 1, "Winter is Coming", a child appears twice. The first time she is on a tree appearing to be dead. The second time one of the men from the Night's Watch sees her standing in front of him staring.
The show seems to call her a wildling, but she appears to look more like one of the Children of the Forest than a wildling. She looks similar to the child in the series finale of season 4.
On the Game of Thrones wikia for Children of the Forest, it makes no mention of the incident. Also, On the page for this episode, it calls her a wildling, and it seems that she has become a Wight.
Is there any proof that this child is indeed a wildling wight, or could this possibly be the first place where the Children of the Forest are revealed?