Hi - New here and also a pretty basic knitter…
I am putting together a beanie for my 3.5 yo son and have a decreasing question…
Firstly you should know that I am using a circular needle and knitting continuously (knitting in the round?). I don’t have a pattern but am just doing a simple wide ribbing (k4 p4). I have 64 stitches in the work using chunky yarn and size 10 needles with 2 colours (navy and red) alternating every 7 rows. Now you can all picture exactly what I am knitting 
So any idea how to decrease? I measured that I have around 16 more rows left in the work until it will fit his noggin. So I need to decrease within these rows.
I have knitted several beanies before but never had to decrease in a rib…
Thanks so much…