no powders po muna as it can cause sipon mamshie. try putting petroleum jelly, calmoseptine, or mupirocin cream po if mild lang. but if very red and parang burn, better check with your pedia.
Hindi po recommended ang powder lalo na sa newborn kasi baka maging cause ng asthma. Try to ask your baby's pedia kung ano pwede gawin or ilagay doon sa neck area ni baby to ease the pain.