mama's help 😣😣😣😣

I'm currently in the hospital, I just had my daughter last night. I have the cutest coming home outfit for it but I put it on early because I just couldn't resist. It's white and it got stained bad from something. I'm getting discharged tomorrow along with my baby. My question is how do you get old stains out of white clothing without ruining the clothing? I'm a huge keepsake collector and was gonna keep her outfit but now it's stained and im heart broken. any tips will do. pic of her and outfit below to grab attention... thanks in advanced!!

before it got stained.