Hi there, my son is 6 months old and has recently started doing cluster spasms where he shurgs his shoulder to his right ear. It lasts only a second or so and goes in clusters of 3 to 10. Some days he has multiple clustures and some days he has none. He is developing normally and shows no mental or physical delays. He is currently teething and has a cold and the doctor did find fluid behind both ears. The doctor saw video of it and told me to keep an eye on it and get more video to bring to the check up in three weeks. Should I be worried about this behavior or is this something many infants do as part of their immature nervous system or learned behavior. Any answers would be greatly appreciated as I have been a nervous wreck. Thanks