After the first few months, if your baby is suddenly sick it is more likely to be caused by a stomach virus rather than possetting. Gastroenteritis is a tummy bug which can come with diarrhoea (runny poo).
This is more serious in babies than older children because babies easily lose too much fluid from their bodies and become dehydrated. If they become dehydrated they may not pass enough urine, lose their appetite and have cold hands and feet.
Get expert advice. If your baby is unwell, or if vomiting has lasted more than a day, get your GP’s advice straightaway.