Past the age of 6 months your baby should NOT have crossed eyes anymore, by that time the muscles should be strong enough to keep the eyes straight. Sometimes depending on the type of eye lid, you can look a bit crossed eyed, but are not really. I would recommend going to an opthamologist. My son's one eye turn in, usually only when tired, and it happens so quickly then goes normal right away. My husband noticed it and I didn't, I did see it in pictures but I thought it was just an illusion from the picture.I was not sure my husband was right, but we did take him to the specialist, and he does have a bit of a lazy eye, not bad enough to treat, but does require monitoring ever 9 months or so,it can never hurt to get it checked out.
