Aww mama, ang haba-haba ng anak mo! Butlig (skin rashes/heat rash) sa 2-year-olds ay super common talaga, lalo na dito sa init ng Pilipinas, a few of us moms deal with this every summer. Try to keep the area dry and cool, dress her in lightweight, breathable clothing, at iwasan ang sobrang sweating if you can. pero honestly, if it's spreading pa or mukhang infected, better have your pedia check it out to make sure it's just heat rash at walang ibang concerns, kasi kids that age skin can be sensitive.