Hello practo user
Your son's height can increase but not till 6.4. still he is in growth phase. So, please take care of his diet according to his requirements. so, that in 3-4 yrs ,he can have achieve maximum height . If you want to discuss in detail ,contact us thru this link.
Next Steps
For more information,or to contact me directly,phone or for online counselling contact-https://www.facebook.com/doctorplanmydiet/
Thanks with Regards
Dt.Ankita