Final answer:
During the ninth month, a baby develops the pincer grasp, using their thumb and index finger to pick up objects.
Step-by-step explanation:
During the ninth month of development, a baby begins picking up objects with thumb and index finger. This ability is called the pincer grasp. The pincer grasp is an important milestone in a baby's fine motor skills development and allows them to perform more precise actions like holding small objects or picking up small pieces of food.
Learn more about development of fine motor skills in babies