Newborns are attracted to the smell of breastmilk, and experiments show that they will vigorously turn away from bitter or acidic smells such as vinegar, ammonia, or rotten eggs.
References
- Shelov, S. P. (Editor-in-Chief). (2004). Caring for Your Baby and Young Child: Birth to Age 5. The American Association of Pediatrics. Revised edition. New York: Bantam Books.
- Steiner, J. E. (1979). Human facial expressions in response to taste and smell stimulation. In H. W. Reese, H. W., & Lipsitt, L. P. (Eds.), Advances in child development and behavior. Orlando, FL: Academic Press.