Final answer:
The age range for babies, or infants, is 0-1 year old, which is the period marked by significant growth and developmental milestones. Once a child reaches one year of age, they are considered a toddler, extending up until three years of age. The correct option is answer 1.
Step-by-step explanation:
The age range for babies, also known as infants, is 0-1 year old. This period is characterized by rapid growth in both weight and size, with babies typically doubling their length and tripling their weight during their first year. The developmental milestones in infancy include the emergence of teeth, often beginning at about six months, as well as the development of motor skills such as sitting, crawling, and potentially taking first steps by the end of the first year.
Once a child reaches their first birthday, they enter the toddler phase, which lasts from 1-3 years old. During the toddler years, children continue to grow, but at a slower pace compared to infancy, experiencing significant language and motor skills development. By age three, toddlers are generally able to run, climb steps, and start engaging in more complex play.