H.B.
M. - my infant son acted the same way when I first started him on probiotics when we first came home from the hospital. He seemed uncomfortable and groaned all night. I too gave a fraction of the recommended dose. I waited a couple weeks and gave even less (maybe 1/5 or 1/4 the recommended dosage) and gave it earlier in the day and he is now perfectly fine with it. I actually use the powder "Flora Baby" by Renew Life and dissolve it in a dose of Organic Gripe Water which soothes the stomoach with fennel and ginger extracts-and he loves it. I give the probiotic every other day as recommended by my chiropractor/nutritionist. One thing she made me look for was a probiotic that is dairy free...she says it is the dairy that often causes the upset, not the probiotic per se. If the container doesn't say dairy free, then it likely has dairy protiens and you should probably switch to one without. Could it possibly be dairy as a culprit of her discomfort?
As for the comment from someone about giving females Yeast.... I'm a little lost. Probiotics are beneficial bacteria for your gut, which help you AVOID developing any yeast problems, especially if you or baby are taking any antibiotics and breastfeeding....
Since you are brestfeeding, you can also take fennel (comes in a bottle of capsules at any health food store) which helps with baby's GI...stomach upset, etc. It's in Gripe Water too, which is given directly to Baby... Hang in there and good luck!