Dreams about children, especially when they involve being trapped or locked away, can evoke strong emotions and symbolize various aspects of your life. In your dream, your third child being locked in a box that is buried may represent feelings of concern or anxiety about their well-being or development.

The box could symbolize confinement or restriction, indicating that you may feel overwhelmed or unable to express certain feelings or concerns related to your child or parental responsibilities. The act of burying the box might suggest that these feelings are being pushed down or ignored, perhaps due to fear of confronting them.

Consider reflecting on your current situation with your child and any underlying worries you might have. It may be beneficial to explore these feelings further, perhaps discussing them with someone you trust or journaling about your experiences. This could help you address any anxieties and understand your emotions better.