How long it takes for a child to heal a little fracture in the arm depends on how old the child is and the fracture, kids close to adults, 12 years old and up, all take about the same amount of time as an adult, about 2-2.5 months or so, and about 1 month of exercise. In the case of children, at 3-5 years old, it takes less time and heals well in about 1 month. In the case of even younger children, the fracture will heal well in 2-3 weeks if it is not particularly comminuted. This is only an approximate time, but it also depends on how the fracture is comminuted, whether there is any impact on blood vessels, nerves or soft tissue contusion, and whether there is any infection, etc. Therefore, depending on the specific conditions of the fracture, regular follow-ups should be conducted, and films should be taken under the treatment of the doctor to look at the healing situation, and active exercises should be carried out, in order to gradually heal well.