It&#x27;s a nice article, but isn&#x27;t this something every parent realizes after their first kid? &#x27;Aaaah&#x27; sounds come first, then maybe an &#x27;oh&#x27; and then the lips come in to make &#x27;mamama&#x27; or &#x27;bababab&#x27; and then it takes a longer time for complex words involving the tongue or non-aspirated sounds to come in (like &#x27;teh&#x27; or &#x27;keh&#x27;).