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Traces of vernix caseosa on a full term newborn.

Vernix caseosa, also known as vernix, is the waxy or cheese-like white substance found coating the skin of human babies.



Vernix has a highly variable makeup but is primarily composed of sebum, cells that have sloughed off the fetus's skin and shed lanugo hair.[1] 12% of the dry weight of vernix is branched-chain fatty acid-containing lipids,[2] cholesterol and ceramide. Vernix of term infants has more squalene and a higher wax ester to sterol ester ratio than preterm infants.[1]


Vernix is theorized to serve several purposes, including moisturizing the infant's skin, and facilitating passage through the birth canal. Vernix is also thought to have an antibacterial effect;[3] though there is little to support a chemical role of vernix in protecting the infant from infection, it may form a physical barrier to the passage of bacteria.[1]

Newborn baby with vernix on parts of her skin


The sebum in vernix is produced in utero by the sebaceous glands around the 20th week of gestation. Vernix appears primarily in full term infants, while premature and postmature births generally lack any.[1]


In Latin vernix means varnish and caseosa means cheesy.

Relation to the aquatic ape hypothesis

The vernix is sometimes offered as supporting evidence for the aquatic ape hypothesis (AAH) that human evolution involved a period of adaptation to a semi-aquatic environment. No other land mammal, including other apes, produces vernix-coated pre-term infants. In contrast, some sea mammals, including the harbour seal, do.[4]


  1. ^ a b c d Schachner, LA; Hansen RC (2003). Pediatric dermatology. Gulf Professional Publishing. pp. 206-7. ISBN 0323026117. 
  2. ^ Ran-Ressler, RR; Devapatla S; Lawrence P; Brenna JT (2008). "Branched chain fatty acids are constituents of the normal healthy newborn gastrointestinal tract". Pediatric Research 64 (6): 605-9. PMID 18614964. 
  3. ^ Hoath, SB; Maibach HI (2003). Neonatal skin: structure and function. Informa Health Care. pp. 71-3. ISBN 0824708873. 
  4. ^ Attenborough, D (2005-04-19). "Sir David Attenborough looks at the 'aquatic ape hypothesis'". BBC. Retrieved 2009-09-25. 


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