No.1 pediatrician recommended brand for Colic (In the infant probiotic category. Based on QuintilesIMS ProVoice Survey, 2020). Clinically-studied and patented Probiotic, L. reuteri. Only probiotic shown to be effective in reducing colic & spit-ups. Promotes a healthy digestive function & regularity. Birth+. Comfort from the inside. Babies occasionally experience digestive issues such as colic, spit-ups and irregular stooling. These, particularly colic, may be related to not having enough good bacteria in the digestive system. Gerber Good Start Soothe Comforting Probiotic Drops contains the unique Lactobacillus reuteri (DSM 17938) that naturally promotes growth of good bacteria in your baby's gut. It is the only probiotic clinically shown to be effective in reducing colic and spit-ups. It also supports healthy digestive function so your baby will have regular stools.