Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for severe breathing difficulty, inability to wake the person normally, a seizure lasting longer than instructed in an existing seizure plan, or sudden severe weakness.
Contact the surgical team promptly for increasing pain, redness, swelling, warmth, or drainage from the incision.
Also call for a new soft swelling near the repair, clear watery leakage, repeated vomiting, trouble passing urine, or new changes in movement, sensation, bladder control, or bowel control.
Any fever in a young infant needs prompt medical advice.
Seek urgent assessment if the wound opens, fluid is continuously leaking, or the sac is injured before surgery.
Routine questions about bathing, activity, school, work, or a planned wound review can usually wait for normal clinic hours.
The article also says
Fever after surgery should be reported.
Every sign above is quoted from the sofidex article on Meningocele repair. If you are not sure, err upward — it is always reasonable to be checked.