Based on analysis of a sample of twins, this study suggests that birth weight is not related to levels of schooling, that it plays only a minor role in the determination of earnings, and that ability differences that are not removed in the within-twins model of earnings are not biasing the results in twins studies such as Ashenfelter and Krueger [Ashenfelter, O., Krueger, A., 1994. Estimates of the economic return to schooling from a new sample of twins, American Economic Review, 84(5) pp. 1157-1173]. (c) 2004 Elsevier B.V. All rights reserved.
Miller, P., Mulvey, C., & Martin, N. (2005). Birth Weight and schooling and earnings: estimates from a sample of twins. Economics Letters, 86(3), 387-392. https://doi.org/10.1016/j.econlet.2004.10.002