while following an object with her eyes is when eye coordinatio develops

Is that all of the question?

When an infant follows an object with her eyes, she's showing some eye coordination, but I wouldn't say that it's fully developed at this time.

http://www.circleofmoms.com/due-in-january-2010/following-objects-with-their-eyes-502023

And, all babies develop differently, on different schedules.

When following an object with our eyes, it requires the coordination of various muscles in the eyes, known as eye coordination. This coordination is a developmental milestone in the early stages of infancy, which typically starts to develop around 3 to 4 months of age.

To further understand how eye coordination develops in infants, researchers have conducted studies to observe their eye movements. These studies involve tracking the eye movements of infants as they follow moving objects or visually track people or toys.

To observe eye movements, eye-tracking technology or methods are used. These technologies can detect and record the precise movements of the eyes, allowing researchers to analyze them and gain insights into the development of eye coordination.

Through these studies, researchers have found that eye coordination skills begin to develop as infants learn to control the muscles of their eyes. Initially, infants may only be able to briefly fixate on an object before their eyes shift away. However, with practice and repetition, they gradually improve their ability to track and follow objects with their eyes.

It's important to note that the development of eye coordination is a gradual process, and it can vary between individuals. Factors such as the infant's overall growth and motor development can also influence the pace at which eye coordination develops.

In summary, the development of eye coordination occurs as infants learn to control the muscles of their eyes through observing and tracking objects. Researchers use eye-tracking technology to study and understand the progression of this developmental milestone in infants.