Zincovit syrup is a multivitamin and is prescribed once daily. It contains zinc and
vitamin D3.
But the concern here are the mouth ulcers, for which you should go and consult a Pedo dentist.
Deficiency of vitamins is not the only reason for ulcers,there are others too.
Next Steps
Get a consultation from a pediatrician for the dosage of syrup.
Health Tips
Do not self prescribe medications, as there dosage also depends upon the body weight of the patient. It may lead to adverse effects.