Well, that's because he's showing what it was like in the Republic days. Most of the children we see are Jedi, which is another thing he wished to convey to us.
In the OT, a lot of the settings are either too filled with military or scum for children. More than likely during the Empire's time, everyone is clinging to their child, and living in fear.
And hey man, there were Ewok children lol
You saw them...