Akhnikh, S., Engelberts, A. C., van Sleuwen, B. E., & Benninga, M. A. (2014). The excessively crying infant: Etiology and treatment. Pediatric Annals, 43(4), e69–e75. doi:10.3928/00904481-20140325-07
Bribiescas, R. G. (2001). Reproductive ecology and life history of the human male. American Journal of Physical Anthropology, 116(Suppl. 33), 148–176. doi:10.1002/ajpa.10025
Burnham, T. C., Chapman, J. F., Gray, P. B., McIntyreb, M. H., Lipson, S. F., & Ellison, P. T. (2003). Men in committed, romantic relationships have lower testosterone. Hormones and Behavior, 44(2), 119–122. doi:10.1016/S0018-506X(03)00125-9
Cohn, D. V., Livingston, G., & Wang, W. (2014). After decades of decline, a rise in stay-at-home mothers. Washington, DC: Pew Research Center.
Ellison, P. T., Bribiescas, R. G., Bentley, G. R., Campbell, B. C., Lipson, S. F., Panter-Brick, C., & Hill, K. (2002). Population variation in age-related decline in male salivary testosterone. Human Reproduction, 17(12), 3251–3253. doi:10.1093/humrep/17.12.3251
Gettler, L. T., McDade, T. W., Feranil, A. B., & Kuzawa, C. W. (2011a). Longitudinal evidence that fatherhood decreases testosterone in human males. Proceedings of the National Academy of Sciences, 108(39), 16194–16199. doi:10.1073/pnas.1105403108
Gettler, L. T., Mcdade, T. W., & Kuzawa, C. W. (2011b). Cortisol and testosterone in Filipino young adult men: Evidence for co-regulation of both hormones by fatherhood and relationship status. American Journal of Human Biology, 23(5), 609–620. doi:10.1002/ajhb.21187
Gray, P. B., Chapman, J. F., Burnham, T. C., McIntyre, M. H., Lipson, S. F., & Ellison, P. T. (2004). Human male pair bonding and testosterone. Human Nature, 15(2), 119–131. doi:10.1007/s12110-004-1016-6
Gray, P. B., Kahlenberg, S. M., Barrett, E. S., Lipson, S. F., & Ellison, P. T. (2002). Marriage and fatherhood are associated with lower testosterone in males. Evolution & Human Behavior, 23(3), 193–201. doi:10.1016/S1090-5138(01)00101-5
Hart, B., & Risley, T. R. (1995). Meaningful differences in the everyday experience of young American children. Baltimore, MD: P.H. Brookes.
Hugh, S. C., Wolter, N. E., Propst, E. J., Gordon, K. A., Cushing, S. L., & Papsin, B. C. (2014). Infant sleep machines and hazardous sound pressure levels. Pediatrics, 133(4), 677–681. doi:10.1542/peds.2013-3617
International Labour Office. (2010). Maternity at work: A review of national legislation. Geneva: International Labour Organization. Retrieved from http://www.ilo.org/wcmsp5/groups/public/@dgreports/@dcomm/@publ/document s/publication/wcms_124442.pdf
Muehlenbein, M. P., & Bribiescas, R. G. (2005). Testosterone-mediated immune functions and male life histories. American Journal of Human Biology, 17(5), 527–558.
National Sleep Foundation. Children and sleep. Retrieved from https://sleepfoundation.org/sleep-topics/children-and-sleep
National Sleep Foundation. (2004). 2004 Sleep in America poll. Washington, DC: National Sleep Foundation.
Soltis, J. (2004). The signal functions of early infant crying. Behavioral and Brain Sciences, 27(4), 443–458. doi:10.1017/S0140525X0400010X
St James-Roberts, I., Alvarez, M., Csipke, E., Abramsky, T., Goodwin, J., & Sorgenfrei, E. (2006). Infant crying and sleeping in London, Copenhagen and when parents adopt a “proximal” form of care. Pediatrics, 117(6). doi:10.1542/peds.2005-2387
U.S. Census Bureau. (2015). Survey of income and program participation: 2008 Panel wave 08. Washington, DC: U.S. Department of Commerce.
World Health Organization. (2006). WHO Motor Development Study: Windows of achievement for six gross motor development milestones. Acta Paediatrica, 95(Suppl. 450), 86–95. doi:10.1111/j.1651-2227.2006.tb02379.x