The presence of fever and diarrhea in a baby may not be directly related to stopping a medication like prevacid. It would be advisable to explore other possible causes for these symptoms. If the fever persists for more than 72 hours, it is important to consult a healthcare professional. Additionally, if the baby is experiencing discomfort from acid reflux, reinstating a dose of prevacid may help alleviate the symptoms. In some cases, teething can also cause fever and discomfort in babies.