Place this clip as the centrepiece of a throwback montage, then follow it with the baby laughing meme for the family reaction shot, and finish the sequence with goofy ahh sounds under the closing credits.
About this sound
This is a roughly nine-second homemade song sung and played by a child around age nine, with a simple melody and earnest, unpolished delivery. It feels sweetly cringe and funny, sparking amused recognition for anyone who took their own early creations seriously. It comes from a personal recording the uploader made as a kid.