I think it is important to remember the age of ds - 6 yo is pretty young.

Honestly, I don't recall very much about any of my elementary years in ps, save for a few things I was passionate about, and those were more at the age of middle school. I don't think this is so uncommon. Do you recall much about those years? We were little. They are little. I struggle to remember this - to go back to teaching those first skills again, as it seems dc should just "have them", but they don't.
Charlotte Mason talks about giving dc the "hooks" to hang future information on. I've begun to think of my dc's minds like bulletin boards. At first, they are a blank bulletin board without much in the way of specific facts "sticking", and I don't mean that in a negative way, I just mean, they are so busy learning how to go about "learning" in general that it takes up a lot of their thoughts and energy.

Things like, "I must sit still in school... I must hold my pencil just so... I must put my books here... I must color like this... I must put away my school things like this..." Not to mention, "I must make my bed like this... put dishes away like that... take out the trash in the mornings..." and other hygiene and house procedures we expect them to do in the day to day.
Each year, as they learn these more day to day things and have them down pat where they no longer need to think about them but rather just do them from memory, they are able to hang a few more "school learning" pegs on their bulletin boards, but they begin with pretty general things. For example, in LHTH, my dc were able to hang some "hooks" on their bulletin boards in regard to Biblical history. This was more familiar, as we've read Bible stories to them from early on, they attend church, etc., so it's easier to retain this information. Then in LHFHG, they added more pegs to their Biblical history, and were able to "hook" on world events to Biblical happenings. As we moved through history, the part after the Biblical history was brand new to them. What they took from that was that history is more than Biblical history and current history. They began to understand the flow of history, the span of it, as well as a few famous names and events. In Beyond Little Hearts, they continued adding to their bulletin boards, new pegs, but not so many, as much of it was new. It was in Bigger Hearts that their bulletin boards began to become fuller, as this took some of what was learned in Beyond in the way of American history and built upon that.
Now my oldest ds in RTR has a VERY FULL bulletin board, much fuller than mine when it comes to history and science I must say.

It is because he has been adding, adding, adding to what he's learned each year. Each time a name or an event comes up again, he can recall with greater clarity what to attach with that name or event. My middle ds in Bigger Hearts will share a name or event at the kitchen table, usually just something quite vague or general, or even in the form of a question like, "Hey, wasn't that the guy who ___?" My oldest ds now can answer with detail. But he is almost 12 yo!
Research in advertisement says that a person needs to hear something 7 times to really recall it and have it "stick". I think this is fairly accurate. I would say that for little ones, it is important to keep in perspective that most of what they are learning is all new to them. Imagine learning an all-new body of knowledge. The first time you hear it, you really won't remember much. Each time a concept is revisited in subsequent years in guides to come, more is remembered. So rather than expecting dc to take it all in the first time, letting them take from it what they can, and knowing it’s coming around again… and again… and again, allows us to “get it done and move on” and in so doing, show them school is not a daily test of what you learned, but rather a lifelong endeavor that is a journey to be enjoyed.
Their bulletin board doesn’t have a one-time shot at getting filled. These young years dc are learning many, many skills for the first time. Listening attentively and learning to comprehend and retain information are all BIG skills to tackle! Dc need years and years of practice within these skills. I wouldn't be discouraged. These skills will come, but they can't be forced. They take real time. They take much encouragement, and oh my, much patience on our part as parents!

The best thing we can do is have an attitude of loving learning ourselves, loving teaching ourselves, loving our homeschooling days ourselves, and though many boys will still answer that their favorite time of the day is "recess" (the answer I received at least 75% of the time from ps students that were boys when I asked what their favorite subject was), they will begin to take more and more of an interest in what they are learning as their "bulletin boards" become filled with pegs and hooks on which to hang more learning upon... if we can just give them time.
In Christ,
Julie