How to change the baby's voice?

There should be no way to completely change this, but you can find a vocal music teacher to learn how to lower your voice, learn to use your abdomen instead of your throat, and your voice will sound much better, and then avoid using ending sounds, such as: ah, la, ah, and so on. It used to be very quiet, like the voice of five or six years old, but now it is just a little sharper and sweeter than ordinary people. It will be very uncomfortable to press your throat at first, but it will be fine after a long time. hope this helps