What does it mean if your baby's eyes do not track together?

Could be important. Depends a lot on the age. For the first few weeks of life, it is common for the eyes to appear misaligned and "not track well" together. After a couple months, most babies will fixate well and the eyes track well together. Mention the symptom to your pediatrician, and see if a referral to an eye md or pediatric ophthalmologist is advisable.