Figure 2.

Course of blood TSH levels in the 12 infants with subclinical hypothyroidism. Each circle indicates the KI dose administered to a mother. Arrows indicate data from the same cases. Black and gray circles indicate subclinical hypothyroidism and normal TSH level, respectively. In 3 infants (*), the blood TSH levels normalized due to discontinuation of KI or stopping breastfeeding, whereas the blood TSH levels normalized during KI administration without cessation of breastfeeding in 7 infants. Two infants (**) could not be followed. One blood TSH level test (***) was performed at another hospital; thus the examination method is unknown.