After birth, children generally grow fastest in the first 3 months, whether it is weight gain or height growth, according to the child’s growth standard measurement, the child’s growth and development in the first 3 months is the sum of the last 9 months. The child is now 7 months old, the late growth is slow is also a normal physiological phenomenon. You can take your child to the hospital for routine blood tests, trace elements, thyroid function, to see if the child’s growth is too slow due to anemia, lack of trace elements, low thyroid function, and to go to the Children’s Health Department for a physical examination to see if the child’s development is normal, if it is just a simple lack of weight growth, there is no need to worry, if the child has abnormal development, such as backward development or delayed development, timely intervention is needed.