Put it at the end of a short edit, right after the reveal, then follow it with baby laughing for a second burst, and save a big yaaay cheer for the final frame so the sequence builds instead of peaking too early.
About this sound
This is a short, bouncy singalong excerpt lasting just over seven seconds, built around a simple repeating melody and light, childlike voices. It gives a listener an instant lift of pure delight, making an ordinary moment feel sunnier and more playful. The excerpt comes from My Happy Song by Super Simple Songs, the children's music act behind the familiar happy happy happy meme.