There are a lot of consonant sounds that are very common across the world's languages. Most languages will have all of these and nearly all of them. When babies are first making sounds, they'll just kind of vocalize fairly randomly. If you make an A sound and then you close your mouth, what happens is this? The air keeps coming out, but it doesn't come out your mouth any longer. It starts coming out your nose. And sure enough, when you closed your mouth and made a sound out your nose, you are making what linguists call a bilebial nasal because it's using both lips and your nasal passages. So the words from mother are quite similar.