It means all potential lives that will live in this village, city, nation, world and universe, in the coming future. So, what does all unborn child here means?

It was revealed later, who is the King, when Shikamaru is playing Shogi with his father, Nara Shikaku, who asked the same question, Shikamaru answers, РІР‚Сљall the unborn child of KonohaРІР‚Сњ, before Shikaku beating Shikamaru in one move, before saying, РІР‚СљyouРІР‚в„ўre not strong enough to protect the KingРІР‚Сњ, smiling. When Asuma dies fighting Hidan from Akatsuki, Shikamaru finally understands who is the true King after hearing his teachers final memento. He then asked Shikamaru, who in their village, best describes as a King? At that time, Shikamaru answers either the Hokage (village head) or the Daimyo (nation head), but Asuma just shrugs and says, he will understand when the time comes. But in describing himself, Asuma just pointed out he is just a sacrificial pawn, who is for sacrifice in the game to protect the РІР‚СљKingРІР‚Сњ. In the conversation between Shikamaru and Asuma (no, IРІР‚в„ўm too lazy to describe their background to the readers who never read/watched Naruto before) when playing Shogi, Asuma describes Shikamaru as the Knight, the piece who can move skipping above other pieces in an РІР‚СљLРІР‚Сњ (similar to chess) that it can trap two pieces at one time, in reference to ShikamaruРІР‚в„ўs over 200 IQ intellect and his ninja skillset. No, for religious smart-asses, IРІР‚в„ўm not talking about our Al-Malik (The King, God), but the King we humans need to see and start thinking about. This particular writing is influenced (and very much influenced my own view) by the conversation between Nara Shikamaru and Sarutobi Asuma on the concept of РІР‚СљKingРІР‚Сњ when playing shogi (japanese chess) and in our life.

Ninja village in the trees