Boudreaux's carrys a line of baby products that includes Butt Bath body wash and shampoo, Baby Butt smooth dry skin ointment and their famous diaper rash cream that contains zinc oxide and will do wonders for your baby's butt! 
 
I also love Boudreaux's Butt Bath moisturizing body wash & shampoo. My daughter has very sensitive skin & her skin really reacted well to this. Some bath products contain alot of fragrance & can be irritatiing to certain skin types but with Boudreaux's we have found this to be not the case. 

You can get a free sample by going to their website http://www.buttpaste.com/BLButtPaste.php