There is an inverse relationship between intelligence quotient and the age of diagnosis, with studies indicating treatment of CH starts no later than the first two weeks of life.2,9 A study done in Nepal has shown that the majority of babies with CH were detected at the age of 6 to 36 months of life when parents noticed some form of delay in developmental milestones.10 In our study, the babies diagnosed in other age categories i.e. after 3 months, intellectual development might be affected to some extent due to delay in diagnosis and lack of regular follow-up for thyroid hormone monitoring. The gene discussed is TG; the disease is cyclic hematopoiesis.