1. Infants' visual targets are close, and when they look at nearby objects, their eyes will be more focused, and the black eyes on both sides will be closer to the inside.
2. The baby's nose root is wide between his eyes, and the white part inside the eyeball is covered by the skin on the nose side, so it seems that the black eyes are all located on the nose side (opposite eyes) of the eyeball.
This phenomenon will naturally recover after the baby is four or five years old.
note:
There are other conditions that may also cause esotropia, such as: cranial nerve lesions, atrophy and deterioration of one side vision, lateral eyeball muscle paralysis, intraocular lesions and so on.
Therefore, parents must not be careless. They should take the baby to an ophthalmologist for a detailed examination to remove the esotropia that may be pathological.
If surgical correction is needed, the sooner the better, preferably before the age of two.