8 month old sleeping terrible

Grace

My guy used to sleep great 10-12 hours without waking. Now within the last month he has had a couple illnesses and teeth coming in so he started waking up at night. It started with a couple times a night and now last night he was literally up every 30 min to 1 hour. Anyone have any advice how to get back on track? Is the only option to let him cry 😢