You have to know a trust that if you follow all the rules on keeping white baby smocked dresses white, they can still become dingy or yellowed over time. So what should you do?
The first step to wash baby smocked clothes is mixing a solution of warm water and oxygen-based bleach like OxiClean. And then submerge your white smocked clothing and soak them overnight. Then you can wash as usual. Nextly, you add 1/2 cup distilled white vinegar to the rinse water.
You can also add bluing to the wash or rinse water to make baby smocked clothing appear brighter by following the directions on the bottle.
If your smocked baby dresses are also white enough, you should use a color remover to strip away any color from the girls clothing without colored trim or decorations on your smocked clothes.
Then you dry the clothing outside in the sun to help to whiten the baby clothing.
The overuse of chlorine bleach can actually cause clothes to yellow. So you only use chlorine bleach if you are familiar with how to use it properly.