Lots of families happen upon unschooling at, or around compulsory school age. Some families start to unschool after their children have attended traditional schools. But what happens when the kiddo is much younger? How do you unschool a kid that is far from compulsory school age? Turns out, it's not much different than what you may already be doing.
First, take a minute to relax. Notice how much your little one has learned already. In these three years, he has learned to walk, run, talk, express complex emotions, climb, roll, jump up and down, count, converse, and a whole bunch of other things. That's fantastic! I'll bet that you didn't do anything super special for this learning to happen. It just did.
New unschoolers, especially those with young kiddos, will read about all the awesome cool things other unschoolers are doing. And they will panic because they may or may not be "doing enough." There is lots of pressure to expose your kiddos to new things. To figure out what their passions are and to explore them. But what if your three year old is hooked to youtube or video games or both? What if he doesn't ever want to leave the house (like my kiddo)? Don't panic. Video games and youtube videos are excellent sources of information. Young kids will be exposed to letters, numbers, words, language.. Not just english but any languages they may stumble upon. Chase loves to watch French Umizoomi episodes and signing time!
Young kiddos probably won't enjoy museums or going to the library or much of the whole wide world right now. They are still very young, and their world is a bit small and mostly revolves around you. As they grow, so will their world and comfort level. Don't focus on all the things you aren't doing with your kiddo (finger painting, swim lessons, toddler story time at the library) and focus on the things you are doing with them. Focus on the things they love doing. Then do more of it, and watch the learning happen at a rate that will blow your mind.