When it doesn’t happen that often, you might be able to count the number of times on one hand.
My kids taught me this.
Trace your inhale up your thumb and trace your exhale down the other side of your thumb before holding your breath at the knuckle. Repeat as required.
Last night we sat for a while, mouths closed, tracing our breath as it slowed until we could count it on one hand.
The things you can count on one hand are not always rare, or extraordinary, but often they are.