From what I've heard, BioGaia Protectis works quite well for colic, gas, and general digestive discomfort, it uses a specific strain called Lactobacillus reuteri Protectis (DSM 17938), which is clinically studied and safe from newborn age, so that gives a bit more reassurance than generic probiotics. My neighbour tried it for her baby's constipation and said it helped regulate bowel movements within a few days, and she liked that it mixes easily into a bottle feed without fuss. On the flip side, some mums feel the 5ml bottle runs out quickly for the price, so that's a trade-off to weigh up. Overall it seems like a solid, gentle option if your baby is struggling with tummy issues, available at Guardian and Watsons locally, which makes it easy to grab.