* ילד חכם (yeled chacham): This is the most straightforward and common translation. "Yeled" means boy, and "chacham" means wise or intelligent. This is a good general option.
* ילד מוכשר (yeled mukshar): This translates to "gifted boy" or "talented boy," implying intelligence and aptitude in a specific area.
* ילד חריף (yeled charif): This means "sharp boy" or "clever boy," suggesting quick-wittedness and intelligence.
The best choice depends on the context. For a general statement about a smart boy, ילד חכם (yeled chacham) is perfectly suitable.