I love to make kid's bows. They
are easy to make and make use of small or flawed pieces of wood that
won't make a full-size adult bow. Don't get me wrong, you should
be just as thoughful about making a nice bow for a kid as you normally
would but design can be seriously overbuilt since they often shoot very
light arrows at short ranges and kids aren't nearly as worried about
performance as adults are.
Specs
I make all my kid's bows about the same way.
48-52" in length
1" wide for maybe half the limb tapering to 1/2" tips.
20#@20"
This design fits just about any kid since even smaller kids can pull
12-14" and about 12-15#. The bow grows with the kids since the
bigger they get, the farther they can pull, the higher weight they can
handle. They are overbuilt enough to go all the way to 24" which
puts the weight in the low 30#'s. I always use osage since it's
about the only wood I use anyway. I'm sure quality hickory could
handle the same design in the same way. Other woods may need to
be wider. The wider they are though, the thinner they usually end
up, and the harder to tiller in my opinion. They are also more
prone to damage and breakage. Kids are tough on bows. Just
watch 'em at a shoot sometime :)

Start with a stave. I like to trim them up a little before
chasing the ring. This one's a beauty. Maybe a bit of a
curveball thrown in. We can fix that!

Here's the ring all chased out.

Then we lay out our bow. Stay with the grain but don't be too
afraid to straighten things out a bit as long as your angles aren't too
acute.

Cut it out. Staying on the line makes it easier later on but if
you are new to a bandsaw, give yourself a little margin of error.
It is absolutely critical that you stay square with the back so turn
the stave as you cut to make sure that is always done.

All cut out to profile.

Now we need to thin it down some. I scribe a line 3/8" from the
back. This will make it really close to floor tiller. You
also have to angle this cut so you have a ridge down the center of the
belly.

Belly thinned down.

Now to the heatgun to correct that curve and add a little reflex.
I use the same caul as my adult bows so there won't be much reflex
added.

All clamped and cooling, clamps correcting the curve as well as the
natural deflex of this stave.

And the result. Ready to tiller. Tillering is done the same
as an adult bow. I usually get it to floor tiller and then
correct the obvious flaws. I string them pretty quick and then
pretty much follow the same techniques as in my
"Tillering
101" tutorial.

And here's the result. A sweet little bow ready for plenty of
action.

I made this one's handle kind of contoured. Very nice to hold and
shoot.

I left a little bit of snake in it just for character.

I try never to miss an opportunity to show off one of my kids.
This is Lainey, my 5 year old.