A number of recent studies show that probiotic supplements and fermented dairy products can prevent or even treat colic, atopic dermatitis, and many other common allergic and infectious problems in infancy. Lactobacillus and bifidobacteria, the two main classes of “good bugs” can greatly improve the health of premature babies and those born via cesarean section. Plus, Perinatal Probiotics: A Research Review, and Choosing & Using Probiotics.