Read! Read to him from an early age, every night. Start with Dr. Seuss and move on from there. Don't try to mix in heavy stuff like the Bible or Greek/Roman/Norse Epics, just keep it very light and fun. Sit him on your lap and have him follow along with his finger. The greatest gift you could possibly give him is the ability to read. The vast majority of our generation today is nearly illiterate. Their eyes strain and their brain starts to hurt after reading more than five paragraphs, and most people struggle horrendously to even read a few sentences out loud without stumbling over every second word. It's a silent crisis that nobody seems to notice.
Redpills and truths are only found in their purest form through books. If you can teach him to eat through books rather than struggle through each paragraph, you will have set THE foundation for all redpilling.
Keep him away from tv as well, but if he must watch tv there's an old program called Between the Lions that repetitively drilled the bare mechanics of reading in a goofy and fun way with monkey and lion puppets. That show did a lot of good for me.
Good luck Anon.