Patients with Hashimoto's thyroiditis can breastfeed. It is important for those in a hyperthyroid phase, especially when taking anti-thyroid medications, to switch to breastfeeding-safe medications beforehand and to regularly monitor thyroid function to ensure it remains within normal limits. Patients in a hypothyroid phase should also regularly monitor their thyroid function and adjust their replacement medication dosage accordingly. Newborns should have their thyroid function and related antibodies regularly tested from birth onwards. (Please medicate under the guidance of a physician.)