You will usually return to your regular thyroid function following the birth of your baby. However, after birth, 1 in 20 people may have ongoing irregular thyroid activity (postpartum thyroiditis). In some cases, your doctor may continue your thyroid hormone treatment until you have completed your final pregnancy. If you are taking medicines or supplements for thyroid dysfunction, check with your postnatal health provider after your baby is born. Be sure to let them know if you are breastfeeding or bottle feeding your baby, since this can affect your treatment.