I put my baby on Evivo at one month, when she was having 10 watery poops every day and grunting/ straining all night. After about a week on it, she started having one giant poop every 2 or 3 days, and while she's still grunting and straining, it's not nearly as bad as it was. I hesitated to spend so much on a probiotic, but it's obvious that it's the real deal by how quickly and dramatically it works. I'm grateful it popped up on my IG!