Definitely the first word a child learns after birth is the word ‘Mother’ in his own language. Its also the most favorite word of every human being. Surprisingly almost in every language mother is initialed by the letter ‘m’. Or at least contains ‘m’ in the word. This is really amazing. What may be the cause? May be its easy to produce sounds from lips for a child. Or they start creating sound like ‘mmmm….’ and ultimately they learn the word mother.
Here is a big list of translation.