Firstly, two first children are on the map.
Secondly, when you come in the arena, a child is hiding behind the board where there is “Select a battle”. Next, select battle 1, you will find another child behind the board “Battle 1 – The newbies”. Then, visit the shop, there is a child on the left corner of the roof. After that, come to the training room, a child is hiding behind the swords. In hero, another child is behind the hero. Next, visit the museum, three children is hiding there. One is in the right corner of the screen, where the amount of coins is. Another is hiding on the ceiling of the statues room. The last one is hiding at the deepest corner of the armory room. Finally, go home. There are the last three children hiding at your home. The first one is behind the windmill. Another is on the flower pot. You can find the last child hiding behind the barrel.
People complain about "Pay to win" games for the wrong reasons! This games badges are possible to obtain without paying, just using time. STOP WHINING ABOUT DEVS TRYING TO EARN A BUCK!
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Thanks for the understanding toreibjo, really appreciated. Hope you enjoy the game!