Boy
noun
A child of a man is no man, it is a boy.
If you know the kun'yomi readings of both of these kanji you should be okay. You have two separate single-kanji words put together by a の. That's why it's the kun'yomi reading - they're separate.
2018年に男の子が生まれました。
A boy was born in 2018.
おめでとうございます、お母さん。かわいい男の子ですよ。
Congratulation, mom. It's a cute baby boy!
あの元気な男の子は来年一年生だ。
That energetic boy will be a first-grader next year.