Physical differences between newborn brains and 3 year old brains

As the child grows, neural connections are made and lost. These subtle differences won't show in the overall structure of the brain, but these new connections would vary from year-to-year if you were to look at the tissue microscopically. Check out the following two diagrams to give you a better idea of what I'm saying. For the second image, it illustrates how the brain continues to develop well beyond childhood. These images of the human brain show the loss of brain cells between the ages of 5 and 20 (warmer colors indicate more cells, cooler colors indicate less).

Thanks, but I'm wondering specifically about in which ways the brain is different between a newborn and a 3 year old, and between a 3 year old and an adult.

It is certain that connections will be made or lost between all ages. We know memories are made and stuff like that. So, I'm interested in making the comparison between a newborn and a 3 year old, and also a 3 year old and a full grown adult.

Perhaps which connections are made between these ages will be in different parts of the brain, and perhaps there is another difference between newborns and 3 year olds, that does not exist between 3 year olds and adults.

I know my question is sort of specific, but it doesn't need to be specifically between 3-30 and newborn and 3. But newborn and 2+ as young as possible, and 2+ and any age beyond that.

So, your 5-20 is great, but the key part I'm looking for is newborn and 2+.

When they say "mature" they mean # of connections as expected for an adult?

You mentioned cells. Which to me indicates essentially brain matter, which I presume refers to connections being made, but could it be something else? or is that a bad assumption I made?

Thanks

Don't know where to find something that specific.

Try these sites