39 year old female, losing hair from breast feeding. Any realistic permanent treatments for thin hair? (photos)

It's difficult to tell from the limited photos but you may be a good candidate for hair transplant if the thinning is confined to the front/corners and your hair at the lower back of your head is normal. I generally dislike transplants for women but in more discrete loss patterns the results can be amazing. In your case I would wait until you are done breastfeeding and your estrogen levels have come back to normal then see what happens to your hair. At that point, you will be able to assess if transplant is necessary and worth the costs for you. I hope this helps