Every now and then my 1yo DS will tense every muscle in his body and shake. At the time he has incredible strength, only this morning his was pressing his cup handle into his face while having his episode and i couldn't wrench it off him till stopped.
Sometimes he does it when he's excited, like when he sees our cats or dog but sometimes it's seemingly random.
Can anyone tell me if this is normal behaviour or if not what other things to look out for.
Many thanks in advance