"How about a tummy pressure machine?"

I was with baby to pick up his cold medication and we saw a gentleman checking his blood pressure in a machine outside the pharmacy counter.

• Daddy, what is that thing called?
• It is a blood pressure machine, to check blood pressure, and actually heart rate too.
• Oh. I see. How about a tummy pressure machine?
• Good thinking. Let me think about it.

Looks like baby will have potential in engineering.