more accurate than dr. fox

We were playing with her doctor bag. She checked my reflexes, heartbeat, temperature, ears and eyes. She said, "I think I see a problem, Mama."

I gasped in horror, and she comforted me by saying, "Let's check your blood pressure first."

She pumped the cuff. "Hmm," she said. "I'm sorry but there is a problem."

I asked what was wrong.

"You see this number?" she asked as she pointed to the sphygmomanometer*.

Yes, but what is wrong?

"It means you need a snack. It's kind of serious."

*I looked that up.