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 trouble breathing, chest pain, fainting, severe weakness, uncontrolled bleeding, or difficulty waking after pain medicine.
These are emergency symptoms, not routine postoperative concerns.
Contact the surgical team promptly for fever, increasing redness, warmth, swelling, pus, worsening pain, repeated vomiting, a swollen abdomen, or a wound that opens.
Also call if urine or clear fluid starts leaking from the navel or an incision.
Seek same-day medical advice if you cannot pass urine, the catheter stops draining, urine leaks around the catheter with increasing discomfort, or there is new blood in the urine that does not settle.
Mention concerns at routine follow-up if they are improving and no urgent features are present.
The article also says
Mild bruising, manageable soreness, tiredness, and a small amount of clear or blood-tinged wound staining can occur early in recovery.
Every sign above is quoted from the sofidex article on Patent urachus repair. If you are not sure, err upward — it is always reasonable to be checked.