Ay, ganyan talaga ang baby acne, parang rash lang siya kaya madali malito! Kung sabi ng pedia mo it's just from the heat or hangin, then tiwala lang sa kanya because pedia mo ang nakita personally. One of my mum friends' baby had the same thing and it cleared up in a few weeks without doing much, just regular baths and light clothing lang. Keep the area clean and dry, avoid too much lotion, and try to keep baby away from direct heat muna. It should go away on its own, but follow up with pedia if it gets worse or doesn't improve in a couple of weeks, okay?