When you see your child wean in their own time at their own pace it kind of seems right. A newborn will feed lots, a 1 or 2 year old pretty often, an older toddler is too busy most of the time - it's not as though a three year old is feeding for half an hour every 3 hours like a tiny baby. Or that they are must always be fed when they demand. Or that they can't function without it. It's just a gradual giving up of something they no longer feel they need.