Fortunately your child does not have any problem. His height and weight are within normal percetiles of growth.Do not compare your child to other children without scientific basic.Growth is genetic to some extent. he will grow very slowly from now onwards. His growth spurt will take place from 13 yrs of age and continue till 21 yrs. Protein supplements
alone will have no effect.An equally balanced diet in carbohydrates,fat ,proteins
and micronutients will help in his growth. take good acre of him and encourage outdoor sports.
Wish him a healthy life