DS 23 months has been being sick for 4 hours now. It's constant every 15 20 mins or so. It could be a sickness bug from nursery or overeating this morning. Normally he isn't sick for more than a couple of hours whatever the cause, I then leave it an hour after last sickness and reintroduce sips of water to rehydrate slowly. He's retching now and only bringing up saliva this has happened maybe 6 or 8 times in the last couple of hours. Do I still wait until he's stopped before offering any water? I feel like he'll just throw anything back up because his stomach is clearly still irritated and not settled. I don't think he's weed since the sickness came on which at the moment isn't an emergency but I'm aware that at some point in the next few hours he will need to rehydrate. It's the length of time the constant sickness has now lasted for that makes me unsure what to do. Thanks