Table 2.

Levothyroxine dosing guidelines in newborns, infants, and children for pediatric hypothyroidism. Doses should be individualized to patient response based on clinical response and laboratory parameters (thyrotropin-stimulating hormone (TSH), T4).

Age	Dose (µg/kg/day)
0–3 months	10 to 15
3–6 months	8 to 10
6–12 months	6 to 8
1–5 years	5 to 6
6–12 years	4 to 5
>12 years, growth and puberty incomplete	2 to 3
growth and puberty completed	1.7