While I was making dinner Jonah started fussing more and more until he was uncontrollably crying. Oddly, he screamed even harder when I picked him up to console his tortured little soul. Sitting at the table seemed to make him even worse, and he refused to eat. (This is very alarming!) I suspected some sort of stomach upset and made him sit through dinner before we went up for bath... and found a huge rash in his diaper area. It was so bad he couldn't even sit in the tub without howling! I felt so terrible, particularly in the knowledge that picking him up under the bum and sitting him on my lap were causing him pain.
After a little research and a visit to his pediatrician, we finally concluded that the diaper rash was caused by the grapes and raisins we had for snack earlier in the day. The acidic foods caused a chemical burn on his sensitive little tush. It's happened before once or twice on rare occasion, though usually smaller and less severe. I'm so relieved to know the cause so I can help prevent future outbreaks of such a terrible rash.