When your toddler start having more complex conversation? Mine is 2,5y old (3 in few months) and It's still very basic one.
For example:
Me: What do you want for dinner?
Him: I want toast
Me: How many toast you want?
Him: two
Me: With cheese?
Him: Yes.
Sometimes he just answers yes or no, or chooses from what I offer him.
So question is when your toddler start having more complex conversations about his day like: Mommy today I play football at school and it's was awesome. He still can do only max 4-5word sentences, but he know I guess hundreds, maybe even more words.