童年用英语表示为"childhood"。这个词源自中世纪拉丁语"infantia"，意思是"婴儿时期"。例如：

My childhood was filled with happy memories. 我的童年充满了快乐的回忆。

She has many fond memories of her childhood. 她有很多美好的童年回忆。

He looks back on his childhood with nostalgia. 他怀念自己的童年。