Many toddlers become attached to their bottles. Besides providing nourishment, bottles also mean comfort and security.
It's important for parents to start weaning babies from bottles around the end of the first year and start getting them comfortable drinking from cups. The longer parents wait to start the transition, the more attached kids become to their bottles and the harder it can be to break the bottle habit. Longer bottle use may lead to cavities or cause a child to drink more milk than they need.