From the Cradle to the Labor Market? The Effect of Birth Weight on Adult Outcomes

Sandra E. Black, Paul J. Devereux, Kjell Salvanes

NBER Working Paper No. 11796
Issued in November 2005
NBER Program(s):Children, Economics of Education, Health Economics, Labor Studies

Lower birth weight babies have worse outcomes, both short-run in terms of one-year mortality rates and longer run in terms of educational attainment and earnings. However, recent research has called into question whether birth weight itself is important or whether it simply reflects other hard-to-measure characteristics. By applying within twin techniques using a unique dataset from Norway, we examine both short-run and long-run outcomes for the same cohorts. We find that birth weight does matter; very small short-run fixed effect estimates can be misleading because longer-run effects on outcomes such as height, IQ, earnings, and education are significant and similar in magnitude to OLS estimates. Our estimates suggest that eliminating birth weight differences between socio-economic groups would have sizeable effects on the later outcomes of children from poorer families.

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Document Object Identifier (DOI): 10.3386/w11796

Published: Sandra E Black & Paul J Devereux & Kjell G Salvanes, 2007. "From the Cradle to the Labor Market? The Effect of Birth Weight on Adult Outcomes," The Quarterly Journal of Economics, MIT Press, vol. 122(1), pages 409-439, 02. citation courtesy of