When the lung and the kidney grow in sizes (from a baby to an adult), what cells are dividing actually?

There are so many different types of cells, do they all divide?

I'd say the stem cells divide and then differentiate to different cell types. But I'm not an expert on this topic.

say for example, when liver grows, hepatocytes will divide rather than a "liver stem cell" divide and differentiate into hepatocytes

in the case of kidney, a "kidney stem cell" is yet to be identified