Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
An unresponsive infant who is not breathing normally needs emergency help, not a routine appointment.
Call the local emergency number immediately and begin CPR.
After hospital discharge, seek emergency help for:
The article also says
For non-emergency concerns, contact the infant’s healthcare team as directed.
Examples include ongoing chest tenderness, feeding difficulty, sleep changes, or questions about returning to normal activities.
Caregivers may also feel distressed, guilty, or unable to sleep after performing CPR.
These reactions can follow a frightening event.
Contact your healthcare team for support if they continue or interfere with daily life.
Every sign above is quoted from the sofidex article on CPR - infant. If you are not sure, err upward — it is always reasonable to be checked.