Your son is indeed small for his age and his height in the lowest 10% for boys of 8 and a half.His weight is of less concern as he is in the lowest 25% for weight.Tics are very common in children. They are most likely to occur when children are inactive such as when watching TV or on long car journeys.They can worsen with anxiety but are not thought to be due to an emotional reaction.Most tics clear up by themselves after a few months, though they can recur from time to time. The only time when one needs to be concerned about tics is when they seem to occur all the time and affect several parts of the body and especially if they are accompanied by vocal tics such as hooting, yelping or swearing. Your son's tics do seem to be affecting several parts of his body at the same time but are not continuous and he is not making any strange sounds.If his tics start or occur all the time then he should be seen by his paediatrician.
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