Removing Baby Formula Stains

Try using powdered dish washer detergent (any brand). Wet the spot on the clothes. Make a paste of the dishwasher detergent and water, and scrub in.
Then in a clean sink, pour hot water over the clothes, being careful not to burn yourself, and rinse the detergent out.

I have four grown children now. When they were small I used Spray n wash on their clothing. I never had stains. I also used burping clothes when they were very small when burping them.