There are the following reasons for convulsions in 3-month-old babies: 1. not real convulsions, just involuntary shaking, possibly in sleep or in play, unconscious shaking, shaking time is not long, about 1-2s then do not need to worry, close observation is good. 2. low calcium convulsions caused by calcium deficiency in children, this situation lasts a little longer, the child does not have loss of consciousness, do not need to use The convulsions can stop on their own without any medication. This situation needs to take the child to the hospital for a trace element calcium examination and give calcium supplements in time, so that the symptoms can improve and convulsions will not occur frequently. 3, if a 3-month-old child has a fever, especially a high fever state, there are cold hands and feet, there will be high fever convulsions, convulsions occur.