Weaning is the process of gradually introducing a baby to solid foods and transitioning away from breast milk or formula. It is an important part of a child's development, as it helps them learn how to eat and digest different types of food. Weaning can also refer to the process of transitioning from drinking from a bottle to drinking from a cup. This is usually done when a child is around one year old, as it helps them learn how to drink from a cup and helps them become more independent.