If your once-chatty child has become quieter around the age of 11, it is usually a reflection of normal emotional and cognitive development rather than a sign that something is wrong. As children begin forming their own identity, valuing friendships and developing a sense of privacy, they naturally become more selective about what they share.
The goal is not to make children tell parents everything. It is to create a relationship where they know they can share the things that matter most, whenever they need support.