making item smaller

How easy is it to make an item smaller. I,m knitting an owl but would like to make a baby one too. I’m using size 4 needles DK wool.

For a toy like that smaller needles and yarn will make it smaller.

So I wouldn’t be able to still use DK?

Besides going down in yarn weight and needle size, as @Jan_in_CA suggested, it is also possible to scale a pattern. In theory it is as easy as just multiplying everything with a number. For example if you want it to be 80% of the original, then you multiply with 0.8. In reality there will be things that you need to adjust because whatever numbers of rows/stitches you come up with might be impossible to use. Also increasing/decreasing might require a bit of own thinking.