One tablet of Maha Swarna Yog should be given to children daily along with cow's ghee & honey or as recommended by your Ayurved physician.
Ayurved classics recommend Swarnaprashan from the time of birth till 16 years of age.
Some prefer giving Swarnaprashan only on Pushya Nakshatra day of the Indian calendar which arrives roughly once in 28 days.
However, according to Acharya Kashyap in order to obtain maximum benefits of Swarnaprashan, it should be given daily..