There is no authoritative information on how long it takes for a newborn’s eyes to get bigger; generally around three months babies’ eyes can open fully and will appear larger. However, if the parents have small eyes, because of genetic factors, resulting in small eyes of newborns, usually can not get bigger. There is no specific clinical data on the exact time when a newborn’s eyes become larger, and most babies’ eyes can fully open at around three months, thus appearing larger. As newborns are immersed in amniotic fluid for a long time before birth, it will cause the eyes as well as the face to have edema. As the newborn grows up, the edema of the face will gradually subside, usually after about three months the edema will disappear and the newborn’s eyes will become bigger. However, the size of a newborn’s eyes is also related to genetics. If the parents have small eyes, it is more likely to be passed on to the newborn. If a newborn’s eyes are small due to heredity, they usually do not get bigger over time. It is recommended that newborns with eye abnormalities be seen promptly for evaluation of their condition and treatment as prescribed by their doctor.