Ay, that sounds like it could be a few things, sometimes babies get a whitish coating na normal lang, pero para sigurado talaga, mas better if you ask your pedia about it, lalo na kung may kasama na redness, swelling, o discharge kasi need niyang tingnan personally. One of my mum friends had something similar and turned out minor lang, pero hindi kami dapat mag-self-diagnose sa ganyan, you know? Dala-dala mo lang sa next check-up mo or kung worried ka talaga, ring the clinic, they're used sa ganitong tanong!