Just in case you want to make a baby kerchief...

Here are the measurements that I use for the baby kerchiefs that I've made.  It's not rocket science but from my experience the hardest part is working out measurements.  I use velcro because it's easier with a baby/toddler but you could just as easily use a press stud or something else.

You will need:
2 pieces of fabric for the front and back of the kerchief: 25cm x 60cm (22inches x 10 inches)
1 piece of flannel or other material for the middle, this helps with trapping the moisture. 25cm x 60cm
  (22inches x 10 inches)
Velcro strip 4cm (1 ½ inch)
Variation:  You could just have a nice fabric on the front and then towelling or fleece or something like that on the back!!

Make a fabric sandwich: with right sides of fabric together and then flannel on top. 
Sew around using a 1cm seam allowance, leaving aproximately 7cm unsewn.  Trim corners and turn out. 
Make corners nice and pointy or as pointy as you can.  Iron and then sew around.
Sew on velcro (I do it horizontal to the long edge).  Et voila you will have a very stylish and dry little person!
Note on measurements: this kerchief will generally fit any child from around 12 months and up (even to 4 years) justreduce the measurements ever so slightly if it is for a young baby.

kerchief pattern