Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Seek emergency care for severe trouble breathing, chest pain, fainting during activity, confusion, or difficulty waking.
Excessive thirst and urination together with vomiting, deep or rapid breathing, or marked drowsiness also need emergency assessment because they can be signs of dangerously high blood sugar.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek prompt medical advice if your child is severely restricting food, vomiting on purpose, using laxatives for weight control, fainting, or showing other signs of an eating disorder.
And for anyone, someone who:
is getting rapidly more short of breath, or has gained several pounds in a few days with swelling
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if you are concerned about your child's growth or if their weight has increased quickly.
A clinician can check measurements and review the overall growth pattern rather than judging by appearance alone.
Routine assessment is also appropriate for:
Frequent snoring, breathing pauses, or daytime sleepiness
Persistent joint pain or difficulty being active
Darkened, thick skin around the neck or underarms
Unusual thirst or urination
Irregular periods or concerns about puberty
Bullying, low mood, body shame, or secretive eating
Very early rapid weight gain, extreme hunger, or slowed height growth
And for anyone, someone who:
has noticed a lump, a mole that has changed, or unexplained weight loss
The article also says
Overweight itself is not an emergency.
Every sign above is quoted from the sofidex article on Overweight child. If you are not sure, err upward — it is always reasonable to be checked.