result taller and heavier parents should have more sons relative to daughters. Using two British cohort studies, evidence was … parents' height and weight using one of the datasets. No evidence of any such relationship is found. …

We study the treatment effect of grade retention, using a panel of French junior high school students, taking … weakest students. We also show that class size is endogenous and tends to increase with unobserved student ability. The … Average Treatment Effect (ATE) of grade retention is negative, again with the exception of the weakest group of students …

Objective: To estimate the causal effect of breastfeeding on children's cognitive skills as measured at ages 3, 5, 7 …). Participants: Data on 11,792 (age 3) and 9117 (age 5) children in MCS and 4923 (age 7 and 11) children in NCDS. Main outcome …: The duration of breastfeeding has a small, but significant, effect on children's cognitive skills in the linear regression …

How does welfare affect the prosperity of mothers and their children? We study this question using a Canadian welfare … reform and by linking administrative welfare records to tax returns, nearly all medical spending, and children's educational … attainment. Eighty percent of mothers in the complier group found employment within a year, and for many, total income rose …

substantial and heterogeneous employment responses that increased average income despite reduced transfers. We find zero effects …