Uy mama, first thing, kung bagong rash o skin issue yan ng baby, please check with your pedia para sure kung ano talaga yan at ano ang safe gamitin. Hindi good idea mag-guesswork with baby's delicate skin, lalo na if it's spreading or baby's uncomfortable!
Once you know what it is, your doctor can recommend the right cream. A few of us moms learned the hard way na what works for one baby might irritate another, so best talaga na doctor's guidance muna bago lagyan ng anything.
Hugs, and let me know how baby gets on!