I have a family member that likes to play rough with their toddler son. Yesterday they playfully shook my son's shoulders (1 and a half years old), it was quite rough so his head went back and forth for a few seconds. He was smiling and then looked a little worried towards the end. By the time I wanted to stop her she stopped. Do you think he could have gotten shaken syndrome? I am really worried. He's been behaving normally. Thanks