Does blepharitis go away with baby shampooing?

It helps. Lid hygiene with baby shampoo can be effective. If not, you may need to add antibiotics like Azasite or emycin (erythromycin).
May help. Difficult for anything to make blepharitis "go away" since it's typically a chronic disease without a single magic bullet treatment. Baby shampoo is often mentioned to help breakup accumulated oils at the lid margin.