Readers who want to know more about the scientific literature behind the book The Wonder Weeks may consult the literature listed below.

Bell, M., & Wolfe, C.D. (2004). Emotion and cognition: An intricately bound developmental process. Child Development, 75, 366-370.

Bever, T.G. (1982). Regressions in mental development: Basic phenomena and theories. Hillsdale, NJ: Erlbaum. Google ISBN 0898590965 ("Google" is used as a verb here).

Cools, A. R. (1985). Brain and behavior: Hierarchy of feedback systems and control of input. In P. P. G. Bateson & P. H. Klopfer (Eds.), Perspectives in Ethology (pp. 109-168). New York: Plenum.
Google ISBN 0306418460

Feldman, D.H. & Benjamin, A.C. (2004). Going backward to go forward: The critical role of regressive moment in cognitive development. Journal of Cognition and Development, 5(1), 97-102.

Heimann, M. (Ed.). (2003). Regression periods in human infancy. Mahwah, New Jersey: Erlbaum.

Horwich, R.H. (1974). Regressive periods in primate behavioral development with reference to other mammals. Primates, 15, 141-149. Available on the web and mirrored here (prints fine)

Plooij, F. (1978). Some basic traits of language in wild chimpanzees? In A. Lock (Ed.), Action, gesture and symbol: The emergence of language (pp. 111-131). London: Academic Press. Google ISBN 0124540503

Plooij, F. (1979). How wild chimpanzee babies trigger the onset of mother- infant play and what the mother makes of it. In M. Bullowa (Ed.), Before speech: the beginning of interpersonal communication (pp. 223-243). Cambridge, England: Cambridge University Press.

Plooij, F. (1984). The behavioral development of free-living chimpanzee babies and infants. Norwood, N.J.: Ablex. Google ISBN 0893911151

Plooij, F. (1987). Infant-ape behavioral development, the control of perception, types of learning and symbolism. In J. Montangero (Ed.), Symbolism and Knowledge (pp. 35-64). Geneva: Archives Jean Piaget Foundation.

Plooij, F. (1990). Developmental psychology: Developmental stages as successive reorganizations of the hierarchy. In R. J. Robertson (Ed.), Introduction to modern psychology: The control-theory view (pp. 123-133). Gravel Switch, Kentucky: The Control Systems Group, Inc. distributed by Benchmark Publ., New Canaan CT

Plooij, F. X. (2003). The trilogy of mind. In M. Heimann (Ed.), Regression periods in human infancy (pp. 185-205). Mahway, NJ: Erlbaum.

Plooij, F., & van de Rijt-Plooij, H. (1989). Vulnerable periods during infancy: Hierarchically reorganized systems control, stress and disease. Ethology and Sociobiology, 10, 279-296. Academic resource here.

Plooij, F., & van de Rijt-Plooij, H. (1990). Developmental transitions as successive reorganizations of a control hierarchy. American Behavioral Scientist, 34, 67-80. Academic resource here.

Plooij, F., & van de Rijt-Plooij, H. (1994). Vulnerable periods during infancy: Regression, transition, and conflict. In J. Richer (Ed.), The clinical application of ethology and attachment theory (pp. 25-35). London: Association for Child Psychology and Psychiatry. Academic resource here.

Plooij, F., & van de Rijt-Plooij, H. (1994). Learning by instincts, developmental transitions, and the roots of culture in infancy. In R. A. Gardner, B. T. Gardner, B. Chiarelli & F. X. Plooij (Eds.), The ethological roots of culture (pp. 357-373). Dordrecht: Kluwer Academic Publishers.
Google ISBN 0792331273

Plooij, F., & van de Rijt-Plooij, H. (2003). The effects of sources of “noise” on direct observation measures of regression periods: Case studies of four infants’ adaptations to special parental conditions. In M. Heimann (Ed.), Regression periods in human infancy (pp. 57-80). Mahwah, NJ: Erlbaum.

Plooij, F., van de Rijt-Plooij, H. H. C., van der Stelt, J. M., van Es, B., & Helmers, R. (2003). Illness-peaks during infancy and regression periods. In M. Heimann (Ed.), Regression periods in human infancy (pp. 81-95). Mahwah, NJ: Erlbaum.

Plooij, F. X., van de Rijt-Plooij, H., & Helmers, R. (2003). Multimodal distribution of SIDS and regression periods. In M. Heimann (Ed.), Regression periods in human infancy (pp. 97-106). Mahwah, NJ: Erlbaum.

Powers, William T. (1973). Behavior: The control of perception. Chicago: Aldine. Second edition (2005), revised and expanded, New Canaan CT: Benchmark Publications.

Sadurni, M., & Rostan, C. (2003). Reflections on regression periods in the development of Catalan infants. In M. Heimann (Ed.), Regression periods in human infancy (pp. 7-22). Mahwah, NJ: Erlbaum.

Trevarthen, C. & Aitken, K. (2003). Regulation of brain development and age-related changes in infants’ motives: The developmental function of regressive periods. In M. Heimann (Ed.), Regression periods in human infancy (pp. 107-184). Mahwah, NJ: Erlbaum.

van de Rijt-Plooij, H., & Plooij, F. (1987). Growing independence, conflict and learning in mother-infant relations in free-ranging chimpanzees. Behaviour, 101, 1-86. Academic resource here. Summary here.

van de Rijt-Plooij, H., & Plooij, F. (1988). Mother-infant relations, conflict, stress and illness among free-ranging chimpanzees. Developmental Medicine and Child Neurology, 30, 306-315. Academic resource here.

van de Rijt-Plooij, H., & Plooij, F. (1992). Infantile regressions: Disorganization and the onset of transition periods. Journal of Reproductive and Infant Psychology, 10, 129-149. Academic resource here.

van de Rijt-Plooij, H., & Plooij, F. (1993). Distinct periods of mother-infant conflict in normal development: Sources of progress and germs of pathology. Journal of Child Psychology and Psychiatry, 34, 229-245. Academic resource here.

Woolmore, A., & Richer, J. (2003). Detecting infant regression periods: weak signals in a noisy environment. In M. Heimann (Ed.), Regression periods in human infancy (pp. 23-39). Mahway, NJ: Erlbaum.