The first is due to congenital genetics. If the infant’s parents have a wide eye spacing, the infant’s eye spacing is often wide due to genetics, and the infant’s weight gain and motor development are similar to those of children of the same age. Secondly, trisomy 21 is caused by chromosomal abnormalities, which can lead to developmental disorders in infants. For example, the infant may have a wide eye spacing and a series of symptoms such as through-handedness, which can be diagnosed by timely chromosome testing.