LO is 19 m and has naturally gravitated to talking about colors and numbers (1-4) so we've just sorta fallen into encouraging that since he is interested. I did wonder tonight if there's any rhyme or reason to starting chatting about one over another (colors/shapes/letters/abcs) or if there is another "group" I'm missing.

Curious to hear others' thoughts! This is all 100% toddler-led - I believe very much in a play environment; I'm not at all interested in Baby Einstein/Baby can read/flashcards/whatever. Just thought I'd see what everyone else is doing/did around this age! His peers seem to enjoy animal sounds, which he knows but seems to have gotten bored with (and strangely, hates MOO-ing all of a sudden).