Primary hypothyroidism caused by chronic autoimmune thyroiditis in a two-year-old girlPrimary hypothyroidism caused by chronic autoiummune thyroiditis is rare before the age of three years. We report the case of a two-year-old girl who presented symptoms of hypothyroidism at eighteen months of age: poor growth and delayed language development. Treatment wih thyroxine resulted in a markedly normalization of growth, language and laboratory data. We emphasize the importance of getting to a diagnosis and treatment as early as possible, including study of thyroid function in young infants with delayed growth. Early treatment is necessary to prevent irreversible neurological and growth deficits.El hipotiroidismo primario por tiroiditis crónica autoinmune es raro en niños menores de tres años. Presentamos una niña de dos años cuyos síntomas de hipotiroidismo aparecieron a los dieciocho meses de vida: estancamiento pondoestatural y retraso en la adquisición del lenguaje. El tratamiento con levotiroxina ha normalizado rápidamente el crecimiento, el lenguaje y los valores analíticos. Destacamos la importancia de realizar un diagnóstico y un tratamiento precoces, incluyendo el estudio de la función tiroidea dentro de la batería de pruebas de un niño con fallo de medro. El tratamiento precoz sirve para prevenir déficits neurológicos o de crecimiento irreversibles.
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