No special equipment is needed. You would simply need to use your phone or a video camera to record your kid talking, singing, and dancing. Be sure there is no background noise or music and that the kid's voice is picked up well. They can talk, sing a song they made up, or even sing a well known song (however the final product will not be representative of any pre-existing song.) The video you provide can include more than one kid. You can use email or a google folder to share the footage with me.
After you share your footage with me, I'll create the music track and edit in the footage to create a music video. I'll send it to you as a video file so you can view and share on social media. Most videos are about 2 minutes long.
Providing footage of the singing or talking is needed, but footage of dancing around is just as important, as it is used to fill the time between the lines of the song. This could be dancing, doing gymnastics, simple close up footage, etc. Use your creativity!