When my daughter was around 6 months old we had one of those baby swings that rocks back and forth. One day she was in it and we noticed that it appeared she was having a seizure her body tensed up and she was turning red. We got her out of it and it stopped and hadn’t happened again until today. She is 18 months now, I had her in my arms, standing up and was swaying her from side to side and it happened. She started turning red and her whole body tensed up. I set her on the floor and she was fine like nothing happened. Anyone else experience this before? Any idea what the reason is behind it?