The main reason why democracy is called a government by discussion and persuasion is because the "majority opinion" of the voting base makes up policy at the state level, and in order to shift a majority opinion it often requires large amounts of debate and discussion of the issues at hand.
Around 6.6% is the answer
When babies are able to babble "ba ba ba" they are in the Canonical Babbling stage. In this stage, babies are learning to recognize and order the sounds in order to form words. This stage starts around 7-8 months of age and lasts until 10-15 months when the first words emerge.