It's a nice article, but isn't this something every parent realizes after their first kid? 'Aaaah' sounds come first, then maybe an 'oh' and then the lips come

It's a nice article, but isn't this something every parent realizes after their first kid? 'Aaaah' sounds come first, then maybe an 'oh' and then the lips come in to make 'mamama' or 'bababab' and then it takes a longer time for complex words involving the tongue or non-aspirated sounds to come in (like 'teh' or 'keh').