You can start deworming at 1 year and repeat at every 6months. There are different types of deworming drugs and they can be bought without a doctors prescription. Albendazole is a good choice."Albendazole (any brand) will be okay - 400mg (1 tablet or 20ml syrup) once for children above 2yrs and 200mg (half-tab or 10ml) for children aged 1 -2 years