If he is not having any other symtoms, and eating well, this weight appears to be normal.just add  high protein food to this diet to gain weight.

Wait of child is acceptable for his age......not to worry.....just make sure he eats well and frequent meals are good

Hi. Your child's weight falls between -1 to -2 z score which is low for his age. You should modify his dietary habits. Try to incorporate more of energy dense foods like adding ghee to his roti or daal chawal, banana atleast 2-3 per day, mango, adding sugar to his milk, etc. Also you should do deworming with albendazole atleast once a year.