Possible conflict: Maybe the babies lose something important, and the fox helps them find it, or they encounter a magical element. Since it's for a comic, maybe some humor and slapstick elements would be appropriate. The setting could be a forest, a magical land, or a small town.
Conflict stages: The babies find a treasure map, the fox helps them, they face obstacles like a river, a cave, maybe a talking animal antagonist, reach the treasure which teaches them a lesson instead of material wealth. dos bebes y un zorro 40 comic completo
I should also think about character dynamics. The fox is the wise guide, the two babies have their own distinct personalities, perhaps one is more daring and the other cautious. a magical land