my daughter is 6 months old i noticed a few weeks ago that she has one pupil bigger then the other mainly in dim light and her eyes are slightly different colours. she can see well and she does not have any other symptoms . i saw a baby eye dr yesterday who put some drops in her eyes and confirmed mild horners syndrome and has refered her on to see a paediatrician for xrays etc to rule out any underlying cause, he said it was most likely to do with her birth even though she was a planned csection which i thought went very well as she was in good condition but only weighing 5lb 10oz (thats why she was csection). if anyone can give me any advise or has been through this with their baby please write back. the eye dr said try not to worry but that is near on impossible. thanks for your time.x