Calcium deficiency in 10-month-old babies can be manifested as convulsions, laryngospasm and hand and foot twitching with varying degrees of active rickets. 1. Convulsions: 10-month-old babies suddenly occur limb twitching, facial muscle tremors, confusion, seizure time is not fixed, from a few seconds to several minutes are possible. After the convulsions stop, the consciousness returns to normal, often depressed to sleep, wake up lively as usual. There is usually no fever. 2. Hand and foot convulsions: sudden hand and foot spasms in the form of bowing, both hands in the form of flexion of the wrist, fingers straight, thumb inward palm, tonic spasms; foot and ankle joints straightened, toes at the same time, downward bending. 3. Laryngeal spasm: it can lead to respiratory difficulties, and sometimes asphyxia can occur suddenly, resulting in severe oxygen deprivation and even death of the baby. 4. Rickets: different degrees of bone changes and delayed development of motor function can be seen. If you find that your baby has calcium deficiency, you should go to the hospital in time, and under the guidance of the doctor for standardized treatment as early as possible, in order to reduce the adverse effects of the disease.