maybe. it would not be overly harmful to eat expired yogurt or drink sour milk for that matter but expiration dates are there to insure freshness of the product and safety. there are many reasons for a child to vomit but that yogurt may have been contributory. vomiting is one way for your body to get rid of an offending substance so maybe most of the yogurt was expelled.
is it safe for a 6 year old child to consume yogurt one week after the expiration date? . my husband gave our 6 year old son yogurt that had expired one week ago our son had a terrible stomach ache and eventually vomited. could this have been from the yogurt that was one week over the expiration date.