The first stage of motor development in a child is Infanthood.

Infancy is the period of life from birth to two years old, during which a child undergoes significant physical and motor development. This stage is characterized by rapid growth and the acquisition of various motor skills that are essential for a child's physical and cognitive development.

Key Points:
- Infancy is the first stage of motor development in a child.
- It is the period from birth to two years old.
- Rapid growth and acquisition of motor skills occur during this stage.

Physical Growth:
During infancy, the child experiences rapid physical growth. This growth is evident in the increase in height, weight, and overall body size. The child's muscles, bones, and organs also develop and mature during this stage, providing the foundation for motor skill development.

Motor Skill Development:
Motor skills refer to the ability to control and coordinate movements of the body. In infancy, motor skill development is characterized by the progressive acquisition of various skills, which can be divided into two categories:

1. Gross Motor Skills:
Gross motor skills involve the large muscles of the body and enable activities such as crawling, walking, running, and jumping. Infants gradually develop the ability to control their head, neck, and trunk, allowing them to lift their head, roll over, sit, crawl, stand, and eventually walk. These skills are crucial for the child's overall mobility and independence.

2. Fine Motor Skills:
Fine motor skills involve the smaller muscles of the body, particularly those in the hands and fingers. Infants initially have limited control over their hands and fingers but gradually develop the ability to grasp objects, manipulate toys, and eventually engage in more precise activities such as using utensils or drawing. Fine motor skills are essential for tasks requiring dexterity and coordination.

Conclusion:
Infanthood is the first stage of motor development in a child. During this stage, the child experiences rapid physical growth and acquires various motor skills, both gross and fine. These skills lay the foundation for further motor development in early childhood and beyond.