Try not to panic. Thyroid nodules are very common and the vast majority are benign. I think about 95% are benign.

And even if it is cancer, which the odds are against, thyroid cancer is not what you might be imagining when you hear "cancer". At your age, the survival rate is over 99% and they very rarely use chemotherapy or radiotherapy or any ongoing treatment. They just remove your thyroid and maybe some lymph nodes. I had thyroid cancer in 2020 and missed a month of work before returning to normal life (and then another month after that, the world shut down!).

It would be unlikely to have much impact on your baby. You'd likely have recovered before she was 18 months old. The only possible issue that might arise would be if you needed radioiodine treatment, which is really just swallowing a tablet, but you can't be around small children for a couple of weeks afterwards (to protect them from the radioactivity) so you would probably need somebody to mind her for a short period.

But this is all really worst case scenario. The odds are you just have a thyroid nodule, as many people do. 

Hello, thank you so much for your reply, I think that I just constantly jump to worst case senario and then i google and i freak, this reply has really eased so much  of my anxiety so thank you very much.