The breastmilk probiotic strain Lactobacillus Ferementum CECT5716 in reaserch demonstrated gastrointestinal, and upper respiratory tract infection outcomes.   

"Studies have shown that Lactobacillus Fermentum CECT5716 reduces the incidence of gastrointestinal infections in infants 1-6 months up to 71% and infants 6-12 months by up to 41% [2].

The reserch links are as follows :

1. Gil-Campos Mercedes, López Miguel Ángel, Rodriguez-Benítez M Victoria, Romero Julio, Roncero Inés, Linares M Dolores, Maldonado Jose, et al. 2012. "Lactobacillus fermentum CECT 5716 is safe and well tolerated in infants of 1-6 months of age: a randomized controlled trial." Pharmacological research : the official journal of the Italian Pharmacological Society 65 (2): 231-8. doi:10.1016/j.phrs.2011.11.016.

2. Maldonado, J etal. 2012. "Human milk probiotic Lactobacillus fermentum CECT5716 reduces the incidence of gastrointestinal and upper respiratory tract infections in infants.". J Pediatr Gastroenterol Nutr. 2012 Jan;54(1):55-61. doi: 10.1097/MPG.0b013e3182333f18.