No, it is not true that the eyeballs are fully grown at birth. The eyes undergo considerable growth especially during the first two years of life, with a second growth spurt occurring around puberty. The length of the eye of a newborn is about 16.5 mm, while that of a full grown adult is about 24 mm.
According to the Chicago College of Medicine, eyes do continue to grow after birth. A newborn's eyes are about 75 percent the size they are going to be when fully grown well as growing larger. The optic nerve and internal eye structures are not fully formed at birth. Newborns do not respond much to visual stimulation, but they are able to track moving objects with their eyes within two months. In addition, a baby's ability to see clearly keeps increasing with age. At birth, a baby's eyesight is about 20/400, but it develops to 20/20 by 2 years.
The only human body part that does not grow after birth is the ossicular chain, which is composed of three small bones and is located in the middle ear. These bones are also the smallest lightest bones in the human body. Each bone is smaller than a grain of rice.
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