Ay, nakikita ko ang concern mo! Meron kasing maraming ganitong rashes sa babies na super common lang at hindi alarming, like newborn acne, which looks like small red or white bumps usually on the face, or milia na parang tiny white bumps lang sa skin niya. May isa pa na erythema toxicum, na nagmumukhang red patches with small yellow or white bumps, at ito ay totoo namang harmless at natural lang sa newborns. Ang important thing ay tingnan kung saan exactly, kung kumupas or tumataas pa, at kung may fever o iba pang signs. Someone in my mum group mentioned na marami ring factors like fragrances, certain metals sa tela, or sobrang init na nagkakaproblema, so check din ang detergent or fabric softener na ginagamit mo. Better to have your doctor or dermatologist check it though, para sigurado tayo kung ano talaga at walang guesswork!