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Why are my thumbnails very thin/bumpy?

Both of my thumbnails have become very thin, weak and bumpy. Note that ONLY my thumbnails are this way! My other nails are just fine and actually seem quite healthy and strong. My nails were like this for a while, then I got pregnant and they improved. Now that I am 6 months post-pregnancy, I continue to take the pre-natal vitamins but my thumbnails went back to how they were before.

The best way I can describe how they look are horizontal bumps/ridges all up and down the nail. Because they are so thin, it is painful as they often tear.

Any thoughts on what causes this in just the thumbs or what I can do to improve them??