Abstract: Recent data suggest that preverbal infants possess remarkable capacities to process complex events and modify hypotheses about them facing inconsistent evidence. I will review these lines of research and focus on the possible mechanisms that make it possible for infants to think rationally. I will argue that infants have spontaneous intuitions about probabilities and possess a logical sense that allows them to draw inferences online. Such inferential processes allow them to better understand their surrounding world. I will present evidence about the behavioral and neural correlates of these processes.