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
Call emergency services if your child has a seizure, becomes difficult to wake, has trouble breathing, suddenly becomes weak, or develops serious symptoms after a head injury.
A child who is well, developing normally, and following a steady growth curve usually does not need emergency care solely because their head measurement is above average.
And for anyone, someone who:
has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
has had a seizure that will not stop, or does not wake up afterwards
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 is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
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 urgent medical assessment today if rapid head growth occurs with:
Repeated vomiting or poor feeding
Unusual sleepiness or marked irritability
A tense or bulging soft spot while calm and upright
Eyes that appear driven downward
A new headache, balance problem, or vision change
Loss of a skill your child previously had
And for anyone, someone who:
has a fever with a stiff neck, a rash that does not fade under pressure, or severe headache
is vomiting and cannot keep fluids down
has a new severe headache unlike any they have had before
3
Does any of this apply?
Book an appointment
Arrange a routine appointment if your child's head seems large or is growing faster between health checks.
An appointment is also appropriate if you have concerns about development, movement, learning, feeding, hearing, or vision.
The trend should still be discussed during routine care.
Every sign above is quoted from the sofidex article on Increased head circumference. If you are not sure, err upward — it is always reasonable to be checked.