Concept:Human development is divided into stages. Infancy is the earliest stage after birth, marked by rapid growth and foundational learning.
Explanation:Infancyhood begins at birth and lasts until about 2 years of age.
During this time, the child grows quickly in weight and height.
The infant learns to sit, crawl, stand, and eventually walk.
Language begins with babbling; emotions like anger and fear appear by 2–3 months.
Social attachment with caregivers forms, and cognitive abilities start developing.
Physical milestones include doubling birth weight by 6 months and tripling it by 1 year.
These changes make the first two years a distinct and crucial developmental period.
Answer:The period of infancyhood is from birth to 2 years. Hence, the correct option is D.