Ohh, poor little one, yeast rash can be quite stubborn, so you are right to look into antifungal cream specifically. From what I understand, clotrimazole is the active ingredient most doctors tend to recommend for this, and it is available over the counter at most pharmacies like Guardian or Watsons without needing a prescription. Someone in my mum group mentioned their KK doctor advised applying a thin layer of clotrimazole cream first, then sealing it with a barrier ointment like Vaseline or zinc cream on top, and that combination helped clear it up within a few days. Do also try to give baby some nappy-free time each day to let the skin breathe, as that really does help speed up recovery. That said, since the rash has already persisted for a few days with white spots involved, it would be best to get a doctor to confirm before you start any treatment, just to be safe, sayang.