I wish I'd known about Evivo when my son had his 2 month vaccinations. He had horrible gas and reflux for almost a month and a half after. Until the week I started giving him Evivo. I had planned to give it to him before his next round, and start early. Little did I realize how much his altered gut flora had changed his behavior. We thought we'd never have our happy baby back. We are one week past that second round of vaccinations. Still taking Evivo, and seeing our son have a much speedier recover from the havoc those cheap preservatives reek on his tiny body. Evivo is a godsend!