What is the best product for dry baby skin?

Dryness: I am assuming you mean that you want to moisturizer your baby's skin. There are a lot of products out there, including non-soap washes (like cetaclenz and others). Basically you want something that doesn't have any fragrances or colors (dyes). And applying a moisturizer right after a bath, while the skin is still moist, will help lock in that mositure.