The graph is an event-study figure titled "Medicaid Coverage and Birth Weights among Births to Immigrant Mothers." The chart plots estimates of the difference in the birth weight between births to immigrant and US-born mothers, relative to the year before the Medicaid expansion, when prenatal coverage was expanded to undocumented immigrants. The y-axis ranges from -40 to 60 grams, and the x-axis ranges from four years before to five years after the expansion. In the year of the expansion, the birth weight difference is 5.2 grams, and the difference increases to 45.8 grams five years after the expansion. Source: Researchers' calculations using data from the US Census Bureau and California birth records