Four-month-old baby’s hands and feet keep stirring may be the performance of play, or due to vitamin D, trace elements calcium deficiency caused by plant nerve dysfunction, the child in sleep sleep or night sweats, back discomfort, back scalp itching performance, so the child will show the phenomenon of hands and feet keep stirring. It is also possible that the child has abdominal distension or abdominal discomfort, and when indigestion occurs the child does not know how to express it, so he or she will have stirring of the hands and feet. When your baby stirs his arms and legs, look for crying and discomfort. If not, consider it to be playfulness. If the child is crying or has obvious facial expressions of discomfort, you can observe whether the child has bloating or whether the child has night sweats during sleep or whether there is pillow baldness, etc., and determine the specific cause based on the child’s condition.