Firstly we suggest that natural baby colour is the best. Whatever colour your baby has is conceived from parents only. So be proud of both yourself and your baby.
Better option would be to look for soap with least amount of harmful chemicals. This post will help you achieve of what to look in baby soap or wash before buying it.
Whether you are buying a baby soap or baby wash or baby powder or baby shampoo or baby oil or baby cream make sure it has low of these harmful chemicals.