This is a simple knit, based on the “Seed-Pearl Block Stitch” from Barbara G. Walker’s 
A Second Treasury of Knitting Patterns. As the book says, “…this subtle arrangement of tiny purl dots can be worked by any person capable of counting up to eight.” 
Okay then, that works for me!

The finished blanket can be as big as you like. Sample is 24” x 24”, but you can easily make any size square or rectangle by changing your yarn weight, needle size and/or stitch count.

You have total flexibility on gauge here. It will be based on your yarn weight and needle size. Sample gauge is about 18 stitches = 10cm.

Use a soft, cozy yarn. Sample was knit with one skein of Loops & Threads Snuggly Wuggly, an easy-care DK-weight option for a donated baby blanket. (You could use just about anything for this design, adjusting stitch count as necessary for very fine or very thick yarns.)

You will need a circular needle of the appropriate size for your yarn and a tapestry needle for working in ends.