If your baby us older and her eyes continue to cross, move inward or outward, or don't appear to focus together, strabismus might be to blame. Strabismus is a misalignment of the eyes resulting from a failure of the eye muscles to work together. Early detection of strabismus or other eye disorders is important for preserving a child's future vision. An eye doctor can perform several tests on babies and young children to determine if treatment is needed.
Source: Strabismus(Esotropia and Exotropia). University of Michigan Kellogg Eye Center, 2007.