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 if your child is difficult to wake, has severe trouble breathing, has a seizure, or becomes unresponsive.
Arrange an appointment sooner if there is persistent diarrhoea, pain, poor appetite, unusual thirst, frequent urination, marked tiredness, or difficulty feeding.
Seek same-day medical advice if your child has repeated vomiting and cannot keep fluids down, has very little urine, or is becoming unusually weak or sleepy.
These symptoms require urgent help regardless of the growth concern.
Book a routine appointment if your child’s growth has slowed, weight is falling, clothes have stayed the same size for a long time, or puberty appears later than expected.
And for anyone, someone who:
The article also says
Delayed growth by itself is rarely an emergency.
Every sign above is quoted from the sofidex article on Delayed growth. If you are not sure, err upward — it is always reasonable to be checked.