My baby gets rashes and stomach infection loose motion again and again as she turned 5-6 months .. don't know why what is the problem .. doc days it is lactose intolerant as no milk suits her .. then she switched off to nanlolac powder than now she is on cow milk but after 15-20 days she gets same problem ..we have tried different milk and powder but the problem persists .. plz tell what is the issue .. and what should b done nd given to her ?