From September 1870 to February 1871, the Prussian army’s siege of Paris resulted in a harsh famine. Using original data from vital records and military registers, we investigate the impact of the siege in terms of both mortality and the height stature of survivors in one of the poorest areas of the city. We first estimate that deaths more than doubled at all ages during the 6-month siege and that child mortality rates increased by more than 25% (10 percentage points) for children born in 1869 or 1870. Second, we find little impact of famine on the height of individuals less than 5 years old during the siege, but a rather large deficit exists at ages 6 to 10. After having examined selection effects linked to mortality, fertility and migration, we argue that the siege was short-lived enough that many early-age survivors were able to catch up in stature.