What are some good learning apps or activities for babies and how soon can I expose them to it

fisher-price is great. i started my son at two. he has a tablet with all different learning games. and can do them all by himself, knows how to count to 5 and know a-g of his alphabet.

There's a lot of videos on Hulu and Amazon also. Those you can start with the day their born. The first 3 years is when they soak up the most knowledge so it's good to read to them and talk to them like adults play music stuff like that