3 month old with enlarged ureters, on chronic amoxicillin. 2nd round of thrush and now starting to have constipation. is there a probiotic to use?

Lactobacillus.: Though some will recommend the use of any probiotic strain or those in yogurt, lactobacillus rhamnosus (especially lactobacillus gg) is one of the more extensively studied probiotics and may offset side effects associated with antibiotics.The fact that your child is on antibiotics suggests that the level of kidney involvement is significant, therefore continue to take the antibiotics as suggested!