Baby sign! My spouse used to be an ASL interpreter (before our kid was born), and so we did baby sign with our kid from an early age. It really made such a difference, especially during the Terrible Twos. "More" was a very useful word. :-D

Some of my most treasured memories of my very small child have to do with creative, fractured sign invention; their little brains really want to use language, even before their mouths are ready to produce it well.