Morphological developmental norms have been recognized for monolingual English and Spanish speakers but are less established for bilinguals. In addition, cross-linguistic influence may affect each language's development so it is important to consider both languages in the development of bilingual speakers. This study assessed 12 typically developing Spanish-English bilingual children in preschool (4- to 5-year-olds), comparing their performance in L 1 (Spanish) and L2 (English). The primary task was a created doze task in which the children had to apply six morphological rules in each language. Generally, these children did not follow monolingual patterns in that they acquired morphemes in a different order. Exposure patterns and cross-linguistic transfer may have contributed to performance. Age did not appear to impact performance. This study helps fill the gap in research on bilingual language acquisition in Spanish-English bilingual children.