Honestly, I didn't have a kid that did those things (early math or reading) in fact my kid had Einstein syndrome. So take my advice with a grain of salt, since I didn't have that going on and had a completely different experience than those with children hitting everything early.
That said, I think the best enrichment is spending time with them, talking to them, showing them what you are doing, explaining what you are doing.. when you are cooking, show them measuring… take them to the grocery store and count apples for them, etc. They will pick up on what is developmentally appropriate for them. But always the best enrichment is time with a parent who is interacting with them.
