How to get stains out of my son's clothes && stop them from staining?

Once a stained item has gone through the dryer, it's pretty much a lost cause.
Stain removal treatment often depends on what the stain is.
I know for most stains, if I was it out ASAP with cold water and hand soap we are off to a good start. Spray n Wash works on some simple stains, somethings require OxyClean. Some stains come out nicely with white vinegar.
But ALWAYS soak a stain as soon as possible in cold water.

bibs for prevention.I guess don't put him in nice things,this way you wont care if it gets ruined!

Baby Oxy is the best stain treatment! It even works on old stains, it's my favourite product of all time!!! But it HAS to be the BABY one, the regular one isn't very good.

I'm a fan of Stain Stick. Also depending on what the stain is (baby poop) - the sun helps a lot, too. There's really nothing to prevent them, though. Bibs can help.

I also used the Baby Oxy Clean. It will get any baby stain out, even if you've already washed the item.