Final answer:
Babies usually start to walk at around 12 months during Piaget's sensorimotor stage.
Step-by-step explanation:
Babies usually start to walk at around 12 months during Piaget's sensorimotor stage. According to Piaget's theory of cognitive development, the sensorimotor stage lasts from birth through age 2, during which a child learns about the world through senses and motor behavior. By 12 months, babies may be able to stand while holding onto furniture or someone's hand and may even take a few steps with the support of a push toy.