You trust someone when you think you can predict their behavior under challenging conditions.
According to social expectance theory, you work effectively with your peers when you can predict their behaviors, even if they don't share the same attitudes and values.
If your team does small-batch-size activities, members are exposed to more learning cycles, increasing their behavior prediction.
Small batch-size activities increase the interactions, increasing their behavior prediction. Once they can foretell how they'll act, they trust each other.