Babies start learning from the moment they are born, and their brains develop rapidly during the first few years of life. While babies are born with certain reflexes and instincts, the first thing they learn is how to bond with their caregivers.
From birth, babies learn to recognize and respond to their caregivers' voices, smells, and touch. They also begin to learn the difference between day and night and how to regulate their own sleep-wake cycles.
In the first few weeks of life, babies start to learn to communicate through crying, cooing, and making eye contact. They also start to develop their sense of hearing, sight, taste, and touch.
Around 3-4 months of age, babies start to learn how to reach for and grasp objects. They also start to develop their gross motor skills, such as rolling over and sitting up.
Overall, the first thing a baby learns is how to bond with their caregivers and start to make sense of the world around them through their senses and experiences.