Just recently Austin has started getting rough with Jackson. He will put things on his head, knock him over, try to pick him up and put him on the couch, or pat his back or head too hard. We are having to watch very closely to make sure Jackson is safe.
Most people would probably go straight to sibling rivalry for the answer to why he is acting this way, but I don't believe Austin is doing any of this to be mean. My theory is that Jackson is looking older and crawling around and playing, which makes Austin think he can wrestle with him and that he doesn't need to be as gentle. There might be a tad bit of jealousy or something, but I'm not totally convinced of that.