A grown-up may know tens of thousands of words.
You start with just one word as a baby and keep collecting more your whole life. That is a giant word collection!
More facts about First Words
Many babies say their very first word around one year old.
"Mama" and "Dada" are common first words for babies all around the world.
Babies understand many words before they can say them.
Little children often learn names for family and food first.
By the time they turn three, many children know hundreds of words.