Hai, baby rash mmg common jugak especially dalam cuaca panas macam sekarang ni, bisa jadi heat rash, diaper rash, atau allergic reaction depending on where exactly the rash is. Best thing is to check with your pediatrician as soon as you can, especially if the rash is spreading atau baby seem uncomfortable, sebab sometimes kena treatment khusus macam antifungal or antibiotic cream. One of my mum friends punya baby had a similar issue and it turned out to be fungal, so better get it checked out rather than guess-guess!