My daughter has rash on her cheeks neck and chest. my mum swears it's prickly heat but it is spreading down her back it's been there since wednesday ?

Rashes: Rashes are best diagnosed by actually seeing them. How is your daughter acting? Any fever recently? Any other symptoms? Is the rash bothering her (itch)? What does is look like? These are all important bits of information that will help your pediatrician decide what you are dealing with and the best way to approach it.

Mother knows best: even better is baby's pediatrician.