It should be taken into account whenever screening test are done in neonates. No problems have been reported when the usual therapeutic substitutive dosage is used to keep the mother euthyroid. Follow-up thyroid function cautiously in the infant when a higher suppressive dosage is used. Under latter conditions, a lack of ejection reflex despite an appropriate milk production has been observed in animals. American Academy of Pediatrics: Maternal Medication Usually Compatible With Breastfeeding.