Acute gastritis in babies can get better in a few days depending on the cause of the gastritis, including the case of getting better within 3-5 days, if the acute gastritis in children is caused by eating cold things or not very hygienic things, it will get better within 3-5 days after anti-infective and other treatments. There is also the case of getting better within at least two weeks, if the acute gastritis in children is caused by Helicobacter pylori infection, at this time, it is often necessary to apply triple therapy for treatment, such as the application of amoxicillin, clindamycin, omeprazole and other medicines, and most of the patients will be able to slowly get better within two weeks or so.