Final answer:
The progression of motor development in an infant represents the natural sequence of motor skill development and includes reaching various developmental milestones such as sitting and standing. The timing can vary, but the sequence is generally universal, although influenced by individual and cultural factors.
Step-by-step explanation:
The progression of motor development in an infant, which includes stages from rolling over to sitting up, to pulling themselves up to stand, is an example of the natural sequence of motor skill development. These developments occur as part of the infant's physical growth and are considered developmental milestones. Infants typically progress through these stages in a set order, but the timing can vary from one child to another. For example, on average most babies sit alone at 7 months old, yet the actual age range for reaching this milestone can be between 5 and 9 months.
This orderly sequence in physical development is consistent with the concept of continuous development, where growth can be visualized as a gradual acquisition of skills. Alternatively, discontinuous development views growth in more discrete stages, as children step from one level of capability to another.
It is important to note that while there is a general sequence that children across different cultures follow in terms of motor development, cultural practices can influence the timing of when these milestones are achieved. Therefore, while motor development tends to follow a universal course, individual and cultural variations can cause differences in the ages at which certain milestones are reached.