Hi

Dear Customer
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General opinion about your kid situation :

your kid height within normal range , although ideal height would be around 76 cm in this age , but your kid height still within normal range , plus there is no signs of any medical issue , seems active and healthy boy , so first you dont have to worry about your kid growing process 

How to increase baby height :

in this age , there no better way to increase height except only keeping your kid healthy and on healthy diet and allow him to move and play in safe zones , and visit pediatric doctor every now and then to check on your baby health 

How to increase baby height in the future :

after you kid start growing up , and in such an older age such as 6-7 , you can start doing the following :
1. practice jumping and running sports such as basketball
2. avoiding stress 
3. have plenty of rest and regular sleep
4. using legs or lower weights during the day
5. using some vitamins suppliments after consulting your doctor 
6. what is the helpful vitamins and minerals that help you grow taller ( after consulting his doctor ) :
- vitamin A
- vitamin E
- vitamin B1
- vitamin D
- vitamin C 
- zinc 
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Kind Regards