This rainbow balloon birthday invitation is a bright, flat-vector kids party card built around a glossy red balloon and colourful confetti rays. The oversized 'Happy Birthday' headline is set in a bubbly hand-drawn script, with the honoree's name and milestone printed in bold geometric sans-serif — clean, punchy and easy to read at any size. The palette is a cheerful primary mix of vibrant pink, teal, orange, lime and red on a matte white ground, so it photographs brightly and suits both boys and girls. The matching guest page carries the same party energy: white paper with faint colour washes, drifting confetti and rising balloons, a comic bunting canopy, a balloon-string divider, and a countdown of balloon-shaped cells ticking down to the big day. The reply section is crowned by a bobbing balloon cluster and a big outlined 'POP!' — and tapping the invitation card fires a confetti burst, a small delight for parents and kids alike. Every text line is a fill-in slot, so the same balloon design works for any first, fourth or fifth birthday, any name, and any venue. Sending is fully digital: guests open the link, RSVP with a tap, and see a live countdown, directions and a personal note from the family. For the best page, keep the family note warm and short, fill in the venue so the map button works, and set a reply date a week before the party. The bold colours print well on white card stock if you want keepsakes for the family.