Squish bikes - can I raise the stem?

[AnnieKennyfanclub]

I am just trying to adjust DCs squish bike a bit and wondered if I can raise the handlebar stem? I’m looking to give them a slightly more upright position as they grow on the bike?

Page 18 of the manual

https://manualzz.com/doc/32833228/squish-owners-manual
C. Handlebar height and angle
Your bike is equipped either with a “threadless” stem,
which clamps on to the outside of the steerer tube, or with a
“quill” stem, which clamps inside the steerer tube by way of
an expanding binder bolt. If you aren’t absolutely sure which
type of stem your bike has, ask your dealer.
If your bike has a “threadless” stem (fig. 6) your dealer
may be able to change handlebar height by moving height
adjustment spacers from below the stem to above the
stem, or vice versa. Otherwise, you’ll have to get a stem of
different length or rise. Consult your dealer. Do not attempt
to do this yourself, as it requires special knowledge.
If your bike has a “quill” stem (fig. 7) you can ask your
dealer to adjust the handlebar height a bit by adjusting stem
height.
A quill stem has an etched or stamped mark on its
shaft which designates the stem’s “Minimum Insertion” or
“Maximum Extension”. This mark must not be visible above the
headset.

Amazing thank you!