Background: Function words, and more specifically prepositions and prepositional locutions, are considered to be one of the most important difficulties for children with DLD. Aims: To examine the capacity of bilingual children with developmental language disorder (DLD) to comprehend different Spanish prepositions and prepositional locutions in a simple sentence structure, for example, "El gato está sobre la mesa" / "El gato está bajo la mesa" (The cat is on the table / The cat is under the table). Methods & Procedures: We used simple sentence structures to reduce lexical difficulties in order to focus our evaluation strictly on the grammatical morphemes under study. A total of 96 Spanish and Catalan-speaking participants, divided into four groups, were evaluated in an eye-tracking psycholinguistic experiment: 24 children with DLD (average age = 7.8 years, age range = 4.6-12.6), 24 children with the same chronological age (average age = 7.8 years, age range = 4.6-12.2), 24 children with the same linguistic level (average age = 6.8 years, age range = 4.6-9.4) and 24 adults (average age = 22.5 years, age range = 18-30). Outcomes & Results: The empirical data show that, despite some differences, bilingual children with and without DLD can comprehend Spanish prepositions and prepositional locutions under the current experimental conditions. Conclusions & Implications: Our results suggest that the capacity of bilingual children with DLD to comprehend Spanish prepositions and prepositional locutions in real time and within simple sentence structures is preserved.