Hi, I'd like to reinforce to you that your baby is having good care. For us to read a small study about antibodies, when you have a pediatric neonatologist on board, does not make us qualified to decide anything. The presence or absence of antibodies has absolutely nothing to do with the treatment of your baby. Your baby will be treated for her hyperthyroidism. If you stop nursing, she will still be treated for hyperthyroidism.
So ask him that question.
Of course there is nothing you could have done differently. Same as if you were RH negative, the baby would be treated if needed. Same if your baby had immature lungs, or low birth weight. You could not have done anything differently then, either.
I guess you have to think and feel it over, and do what you will feel most at ease about. For me, from a distance, and probably if I were in your exact same situation, I would put much more weight on what the docs are saying, and how good it is for a baby to breast feed when you can, and I would weigh that against the lack of knowledge and anxiety of your mom and husband.
If this is so distressing for you, if you continue to breast feed, then make another decision. Try to think it through, do the right thing for you as well as your child. If you are a nervous wreck over this, then decide to wean her. Of course if you believe you are harming here, despite the close medical follow up by the neonatologist, then you must do what is right for you. Bottle feeding is an option, and some people choose it.
My situation is different, but I had one. To give a little background, I had a baby, was hyperthyroid a few days after delivery, which means that I was most likely undiagnosed for some time before, when I was pregnant. I breast feed, took the necessary drugs for being hyper, took the KI drops before my surgery, had my surgery, continued to breast feed. My baby was not hyper, but I was. If he needed to take ATD's, I would have continued to breast feed. My docs, even back then, said it would have been fine.
I hate to have you experiencing so much distress and stress with this. YOu are tired, with a newborn, and this is hard for both of you.
Shirley best wishes with whatever you decide
TED 2008-present. OD for pressure on optic nerve 02/02/10
Eye muscle surgery 09/23/10 Upper eyelid surgery 02/01/11
Lower eyelids with grafts from palate, 10/5, 10/25/11
Graves dx/thyroidectomy 1959-Synthroid from 1980