Dreaming of a child getting lost and being carried away by waves at the beach can evoke strong emotions and may symbolize various aspects of your life. Here are a few interpretations to consider:

1. Fear of Loss: This dream could reflect a deep-seated fear of losing something precious, whether it's a child, a relationship, or an aspect of yourself. The waves might represent uncontrollable forces in your life that you feel are taking something away from you.
2. Change and Transition: Waves often symbolize change or emotional upheaval. The child in your dream may represent innocence or a part of your life that feels vulnerable to the tides of change. This could indicate that you're experiencing significant shifts or uncertainties.
3. Overwhelming Emotions: The waves could also represent overwhelming emotions or situations. If you are currently facing challenges, this dream might be a manifestation of your feelings of being swept away or unable to cope.
4. Need for Protection: If you feel responsible for the child, this dream may suggest concerns about your ability to protect those you care about. It could prompt you to reflect on your role as a caregiver or protector in your waking life.
5. Exploration of the Subconscious: The beach often symbolizes a boundary between the conscious and subconscious mind. The child being carried away might indicate that there are parts of your psyche or unresolved issues that you need to confront.

Consider your current life circumstances and emotions, as they may provide additional context for this dream. Reflecting on what the child represents to you personally can also help in understanding the underlying messages of your dream.