Another child brought a doll in a toy stroller. She was kind enough to let Sebastian take it around for a spin. At one point, he stopped walking to watch players on a nearby tennis court. And while he wasn't walking, he pushed the stroller gently backwards and forwards - just like we do to keep him happy (especially when he was very little). we were very impressed with his gentleness.
I asked him if he was practicing to take his cousin on walks. He didn't answer me, but he did smile.