Toddlers may refuse milk in a cup due to the smell, a preference for the familiarity of a bottle, or simply as an expression of autonomy. To encourage the transition, involve your toddler in the process—let them watch you pour the milk, and allow them to decide when and how much they want to drink. Keep the atmosphere pressure-free; if they reject it, offer it again later. Remember that after age 1, solids are the main source of nutrition, so don't force milk if they are getting calcium from other sources like curd, cheese, or paneer.