Hi,
If babies have stomach flu then they usually get diarrhoea or slight fever, loss in appetite, stomach ache and vomiting. Little babies are prone to get infection because their immune system is still not very strong and haven't developed antibodies to fight off germs. And, yes, it does spread from an infected child to another. My daughter is 6 but she still is quite prone to it.
If your baby is breastfeeding then let her be on your feed and if she is older and on solids then make her eat curd and nicely boiled mashed rice. Give her soups. All food you can give which are light on stomach.
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