Do you know or own any howling pet dogs? If you do, then better keep your baby away from them, because your baby might imitate and starts a habit of howling from his young age itself.
Here is an adorable video showing a baby howling with pet dogs. Here the big daddy has got two labs, where they both often do howl competition, to see who can howl the loudest. But here the baby too joins them and howls as best as he could.