My grand daughter age 3 was playing with toys and threw one hard one at the baby sister that was on my lap. The toy hit her head and I spoke sharply to her about the fact that she might hurt her little sister with that kind of play.
She stood there for a minute with her finger in her mouth like she was thinking about it. Then suddenly she straighten up her little sholders and marched into the dinning room and stood facing the corner for about 2 minutes. then she came back and kissed her sister head and was all smiles.Recently,Mom and dad had started the time out corner for deeds that were not nice. I was amazed that at that age she was able to deduct that that action was a time out event. She really is a fast study,that girl.!!