Welcome! I started reading everything I could find on giftedness when my DS was an infant. This helped me to process my own childhood and to figure out how to parent my son. I'm glad I started worrying about this stuff early!! (Although, I should have paced myself on the actual worrying, as opposed to learning.)

Board books were a huge hit for my DS, starting around 3-6 months. I wish I hadn't bought so many baby toys, though. They were too simplistic to get much mileage.