When is the color of your eyes determined? It's one of the first things we look at, but there is no hard and fast rule, it depends on each baby. "In some cases, after six what does 20/100 vision look like months they acquire the color that they will have for the rest of their life," explains Dr. Laria, "while in others it may take more than a year." What to do if the baby has a watery eye? This is quite common, and is because, at birth, many children have a blocked tear duct that leads to the nose.