At six months old, a child suddenly lifted their right shoulder, doing so about twenty times that night. We took the child to the hospital, where various tests were conducted, including urine and blood tests, EEG, ECG, CT, and MRI, all of which were normal. However, the child was diagnosed with mild early rickets and calcium deficiency. During the hospital stay, similar symptoms appeared again. The attending physician was not present at the time, and a on-call doctor observed the child and casually mentioned it might be infantile convulsions. The child lifted their shoulder while other expressions were normal.