On a developmental continuum there can be many stops along the way and children will often plateau or remain at one level for a sustained period of time. This is often the situation with sensory and physically impaired children for they need to allow all the various component skills to catch up with another, or to compensate for one another, before they proceed.
To further illustrate the concept of sequential development, let us review visual perception and learning. Again, from a sequential perspective, a baby will understandably be reflexive in nature, but it is important to observe. The next developmental milestone usually is for a baby to begin attending to a light source or an object that contrasts with the background against which the object is perceived. The ability to attend to an object is often referred to as fixation and it is at this milestone that we observe