Probiotics were a lifesaver for us with our colicky baby - we used one called Biogaia from about 12 weeks til about 6 months, and it was a miracle. I has antibiotics in labour which we think killed her good bacteria (completely non-medical opinion!!). We did stop but mainly cos of the cost(!) and being out of the colicky phase, plus my now 14 month has the constitution on an ox (famous last words - in 5 minutes nursery will call saying she has been sick). I would not hesitate to reintroduce if she had any more tummy issues. The probiotic we used was infant specific though, and just 10 drops on a spoon (or in a bottle, if you were lucky enought to have a bottle willing child unlike me!). I also researched at the time, especially as she was so little, and could only find positive things on probiotics for kids, but thinking moves on so thats not to say theres no negative evidence out there - maybe I just didnt dig too deep?