Final answer:
The postnatal stage refers to the period after birth where the newborn undergoes significant adjustments to adapt to the outside world, including changes in sensory perception, physical growth, cognitive development, and interactions with the environment.
Step-by-step explanation:
The postnatal stage refers to the period of life that begins after birth and continues throughout infancy. During this stage, the newborn undergoes significant adjustments to adapt to the outside world. They experience changes in their sensory perception, physical growth, cognitive development, and interactions with their environment.
For example, during the postnatal stage, the newborn transitions from receiving all their nutrition through the placenta to feeding through breastfeeding or bottle-feeding. They also develop their motor skills, such as lifting their head, rolling over, and eventually crawling and walking. Additionally, their brain continues to grow and develop, allowing them to learn and acquire new skills.