The inner part of the core features a house, an apple, the sun, a butterfly and flowers, symbolising the well-being and some of the fundamental rights of the child: a safe home, food and free play in nature. The day of observance marking the World Children's Day “20.11.2021.” and the text WORLD CHILDREN'S DAY are inscribed in the coin core. An image of children connected together in a circle dance, symbolising their cooperation and togetherness as well as creativity and play, is laid out circularly within the coin's ring.

The stylised denomination numeral “25” and the name of the monetary unit “KUNA” are inscribed in the upper part of the coin's core. The lower part of the core reveals the stylised image of a marten. Positioned above the denomination numeral, the name of the monetary unit and the image of a marten, the inscription “REPUBLIKA HRVATSKA” is laid out circularly on the coin's ring surface. Positioned below the denomination numeral, the name of the monetary unit and the image of a marten, on the coin's ring surface, is an image of the coat of arms of the Republic of Croatia. A common oak branch with acorns is positioned at the left from the coat of arms of the Republic of Croatia on the coin's ring surface, while a blooming laurel branch is positioned on the ring at the right by the coat of arms of the Republic of Croatia.

The coat of arms of the Republic of Croatia consists of one main shield and five smaller shields which form a crown over the main shield. The main coat of arms is a checkerboard (chequy) that consists of 13 red and 12 silver (white) fields. It's also informally known in Croatian as šahovnica ("chessboard", from šah, "chess"). The five smaller shields represent five different historical regions within Croatia.