Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Seek emergency care if the baby has trouble breathing, turns blue or gray, is very difficult to wake, or develops another sign of serious illness.
And for anyone, someone who:
Contact the baby’s clinician promptly if:
Breathing difficulty can have many causes and should not wait for a routine appointment.
Follow-up should begin soon after the injury is recognized.
The clinician will track active movement, joint flexibility, sensation, reflexes, and growth of the arm.
Families may be asked to continue a home exercise program between therapy visits.
Routine appointments are important even when movement is improving.
Recovery may be uneven, and shoulder tightness can develop while nerves and muscles are changing.
The care team may adjust exercises, arrange imaging, or refer the baby for a surgical opinion when needed.
The article also says
Keep a record of appointments, exercises, and changes in movement.
Short videos may help the specialty team compare the baby’s arm function over time.
Ask the clinician how to position, carry, dress, and play with the baby safely.
Every sign above is quoted from the sofidex article on Brachial plexus injury in newborns. If you are not sure, err upward — it is always reasonable to be checked.