My bub has severe AR and has to be medicated. She vomits constantly so I was told to put her on AR formula as she was not putting on weight. I did this for a few weeks but she became very constipated too. I was also told brown sugar and water but that didn't work and then I was told that brown sugar and water is a really old remedy and not to use it any more but to use pear juice and water as it is less harsh. This did not work either so I switched to ordinary formula and now I am using S26 lactose free and she is doing well on this. She still vomits but is putting on weight now and is much happier.