 Following a cross-sectional, pilot study, we will conduct a randomized controlled trial to assess the efficacy of two daily doses of iodine as potassium iodate 90 μg, 100 of the WHO recommended dose, and 45 μg, 50 of the WHO recommended dose and the annual dose of 200 mg iodine in iodised oil, via a randomized, controlled trial in weaning infants of lactating mothers living in an area affected by mild to moderate iodine deficiency in Zamboanga del Norte, Philippines, Southeast Asia. 