Strained baby clothes?

As
So I dug out all of my 2 year old sons baby clothes for this baby. When I packed them away they were clean and perfect. I used the Ziploc space saver bags to store them. When I pulled them out today however some them had yellow stains. I tried pre treating and washing them which helped a little but not entirely. Does anyone know what can get these stains out. Please help! Some of these are sentimental value to me.

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