Final answer:
The physical growth pattern is known as the cephalocaudal trend. It is the pattern where growth and muscular development proceed from the head down through the body. In contrast, the proximodistal trend describes growth from the center of the body outward.
Step-by-step explanation:
The physical growth pattern described in developmental biology is called the cephalocaudal trend. This term refers to the way infants develop muscle control from the head and upper body before the lower body. It manifests as the capability to hold up the head, then sit, crawl, and eventually walk, proceeding in a 'head-to-tail' direction. Another developmental trend is the proximodistal trend, which means growth happens from the center of the body outward. This pattern starts with control of the torso before extending to the arms and legs.
The other options listed, such as bilateral symmetry, refer to an organism's body structure arrangement. Bilateral symmetry means the body can be divided into two identical halves. An inferiority complex is a psychological term for feelings of inadequacy, not a physical growth pattern.
Infancy is the period immediately following birth, usually up to one year of age, where we see significant changes in size and developmental milestones. The toddler stage comes after infancy, defined as a child who is learning to walk, typically between 1 and 3 years old.