Hi, my son is now 1.5 years old and from the last two days he was not eating well. Last night he vomited but today he didn't. We thought it could be an infection or viral but he doesn't have other symptoms and passing urine and poo normal. He has a history of acidity and rejected food at that time. We can see he has red cheeks which he generally has during teething and we can see new teeth. So my question is do teething cause acidity??