Ms Poblete, 22, who lives in Brazil, said she had felt unwell but had no idea she was expecting a baby.
The boy was three months premature and was taken to hospital with his mother, where he remains in intensive care.
BBC News - Chile weightlifter has unexpected baby during training
The boy was three months premature and was taken to hospital with his mother, where he remains in intensive care.
BBC News - Chile weightlifter has unexpected baby during training