A TSH value of 6.55 indicates mild hypothyroidism. It is important to keep your thyroid levels well controlled, especially while breastfeeding, to ensure both your health and your baby’s well-being. Thyroxine is safe to take while breastfeeding and does not harm your baby. Continue taking your medicine regularly on an empty stomach, and do not stop it on your own. Your doctor may check your thyroid levels periodically to adjust the dose if needed.