Ay, honestly I'm not too sure kung safe na talaga ang Johnson's sa ganyang edad kasi sensitive pa talaga ang skin ng 4-month-olds, better check with your pedia muna to be safe! A few of us moms tried alternative ways like making sure the room is cool and airy, frequent baths with warm water lang, and light cotton clothes, kaya try that muna habang naghihintay ng doctor's advice.