Prince
noun, suffix
A king kid is the prince. Someday he'll be the 王, if he's lucky, but right now he's just the king's child.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. Also take note that the reading for 子 (し) is changed to じ.
王子が「おはよう！」いってくれた。
The prince said "Good morning!" to me.
王子は小さいころに子犬をかってた。
The prince had a puppy when he was little.
うちの子は王子にハグしてもらいたい、と天にいのってばかりよ。
My child constantly prays to heaven for a hug from the prince.