My 6 month old has had it for a week!! It got pretty bad and she couldn't keep anything down . .at all and started getting dehydrated. We ended up doing 3 tsp of pedialite every 15 minutes for 2 hours. She kept that down so we went to 1 oz every 20 minutes for 2 or 3 hours. After that we went to half soy formula (she's normally on regular formula but our dr said the soy would be easier on her tummy while she has this) half pedialite, 2 ounces total. We are finally up to 4 ounces total, half pedialite, half soy formula. We tried increasing the amount yesterday and she threw it all up so we went back down. We've also been doing a little bit of rice cereal mixed with pedialite during all of this to try and help settle her tummy.
It's been awful. It is really hard to see them so sick. Just make sure he doesn't get dehydrated and wait at least 20 minutes to feed him after her vomits.
Hope he gets better soon.