Yellow on stored clothing? I unpacked my daughters clothes from 3 years ago and they are...

I unpacked my daughters clothes from 3 years ago and they are yellow. Even the outfit that I save that she came home from the hospital surrounded by. They have patch of yellow. Does anyone know from experience how to find this out? I want it out but dont want to ruin her clothes trying to get it out. They are of late regular baby clothes (onezies, nightgowns etc). ANY aid is greatly appreciated!
Answers:    It could be formula or milk stains that have aged.

My solution for stained tot and children's clothing is:

Put about 1/4 cup of Cascade Dishwasher detergent surrounded by a hot load and rinse out them all. It take out 99% of all stains. It is made to work on Protein (food) so it works great on stains as most of them are protein.

My son worked at McDonalds as a grill cook contained by High School and all of his clothes be so greasy. I would do this exact process on all of his clothes and they come out prefect. Running shoes too.

For my Granddaughters and the McDonalds cook I bought lots of yard mart baby clothes and did this. They come out beautifully.
do you smoke .. ?