A comparison of 704 homeless public assistance families in New York City with 524 families on public assistance who had housing found that pregnancy and recent births were highly correlated with becoming homeless. Thirty-five percent of homeless women were pregnant at the time of the interview, and 26 percent had given birth in the past year, compared with six percent and 11 percent, respectively, of women in the housed sample. In addition, having a baby before age 18 (as had 37 percent of the homeless women and 24 percent of the housed women) was significantly related to homelessness but family size was not.