For a 39-month-old female baby, the normal height range is 86.6 cm-109.4 cm, with an average of 97.5 cm. Therefore, as long as the height of a 39-month-old baby girl is higher than 86.6 cm, it is normal, and parents do not need to pay much attention to the height of their children. If the child’s height is lower than this range, you can go to the hospital to check the child’s trace elements to see if there is a calcium deficiency. Calcium is important in the growth and development of children, and children need calcium for bone growth. If calcium is deficient, it can affect the child’s height and cause bone deformation and other problems. You should give your child calcium tablets in time or let your child get proper sunlight, which is good for calcium absorption.