Uy, totally get it, sayang talaga! A few of us tried soaking the stained pieces in OxiClean or Clorox 2 (the color-safe one) for a few hours before washing, and it really worked on the yellowing; another mum friend swears by mixing baking soda with a little water to make a paste, rubbing it on the stains, and leaving it under the sun for a day or two. The sun is honestly magic for baby clothes yellowing, so pag iwash mo na after soaking, line-dry in direct sunlight kung possible. Hope you get to pass them down to your next baby fresh and clean pa!