Milia are tiny white spots caused by blocked pores (inclusion cysts containing trapped keratinised stratum corneum).
~50% of infants have milia on the face, most resolving within the first 4 weeks of life.
They may also occur on the hard palate (Bohn’s nodules) or on the gum margins (Epstein’s pearls). These also resolve spontaneously.
External link (including photos): Oakley, A. (2015). Skin conditions affecting newborn babies. DermNet NZ.
Alternative reference: Rennie & Roberton’s Textbook of Neonatology, 5th Ed, 2005. London: Churchill.