Though Grandma may have taught you that Vaseline was the best moisturizer, petroleum and mineral oil can be irritating to tender, developing skin. With this in mind, Diane Truong and JJ Levenstein—two pediatricians who also happen to be mothers—put their heads together to develop Baby Silk, a hypoallergenic line of products made with natural ingredients like shea butter, aloe, and vitamin-E oil. And the "M.D. Moms" clearly understand a mother's need for convenience, as evidenced by products like sunscreen wipes, umbilical-cord swabs, and a liquid-to-powder lotion in a tube you can open with one hand.