"The growth and development of children is crucial" 或 "The upbringing of children is of paramount importance" 是表达孩子成长的重要性的常用说法。
"Crucial" 和 "paramount" 都可以用来形容重要性，其中 "crucial" 意为 "至关重要的"，而 "paramount" 意为 "最重要的"。
例句：
The growth and development of children is crucial for their future success.
(孩子的成长和发展对于他们未来的成功至关重要。)
Providing a safe and nurturing environment for children is of paramount importance for their well-being.
(为孩子提供安全和养育的环境对于他们的幸福是最重要的。)