During 1977--78, 715 unmarried college students at the Universidade Estadual Paulista, Botucatu, Brazil, were surveyed for their preferences for family sizes and combinations and permutations of sexes of children. The most preferred family size by both male and female respondents was two children. A slightly lower proportion of respondents preferred a family size of three children. Average size of the desired families was approximately 2.76 children. The most preferred combinations of sexes were one male, one female; one female, two males; and two females, two males, respectively, in families of two, three, and four children. Preferred permutations of sexes were those in which the first child was male and subsequent children resulted in an alternation of sexes.