The progeny of 11 women with treated congenital hypothyroidism was studied. They had 17 pregnancies that led to 2 spontaneous abortions, 2 children dead in the first month after birth, and 13 living children. These 13 children have a normal psychomotor development. One of them has a lingual ectopic thyroid as her mother, one has a congenital cardiac defect, one has a minor anomaly of toes. The authors add a previously reported familial case of hypothyroidism in a mother and her four children.