A vibrant cartoon with colours and smooth animation. Create a complete 30-second vertical 9:16 animated cartoon video for children ages 3-7. Show two cute cartoon children, a boy and a girl, playing in a bright colorful park. Keep the same characters and clothing throughout the entire video. They must look like friendly animated cartoon children, not real people. The boy sees a bright red ball and says: "Hey! Look at this ball!" The girl says: "Wow! Can we play?" The boy kicks the ball gently. It rolls behind a tree. The girl laughs and says: "Where did it go?" They look around together and find the ball stuck beside a colorful flower. The boy says: "We found it!" Both children laugh and happily play with the ball. Use clear child-friendly English voices, natural talking and lip-sync, cheerful expressions, smooth colorful cartoon animation, playful background music, and fun sound effects. Keep it wholesome and suitable for ages 3-7. No scary elements and no text on screen. Make it a complete finished video that does not require editing.