Designing a Baby Blanket Pattern

I have a French that saw some wristwarmers I designed (they’re a lace edging pattern that I increased the number of stitches in garter stitch on one side to make the arm part) and asked me if I could make a baby blanket with that edging for her for a baby boy due around January.

Lace Edge Pattern

CO 7
Row 1: k2, k2tog, yo, k2, yo 2x, k1 = 9 sts

Row 2: k1, (in 2 yo) k1, k1tbl, k2tog, yo, k4 = 9 sts

Row 3: k2, k2tog, yo, k5 = 9 sts

Row 4: BO 2, k2tog, yo, k4 = 7 sts

I’d love to do this for her, but I’m not sure how to do this exactly. I want to make the blanket in one piece, as I’m not that great at seaming.

Is there a way to work the pattern on one side, work across the bulk of the blanket, and flip the pattern around to make it work, or is this just too hard? I really want to avoid seaming if it is at all possible.

Cast on the number of sts. you want the blanket wide with 18 sts for the border. Then just do the 4 rows of the pattern and repeat for how wide you want the bottom border. Then row 1 knit the 9 pattern st., knit across, knit the 9 pattern st. you’d do this with every row (1-4) and repeat for how long you want it to be and repeat the same pattern for the top border as the bottom. No seaming needed.

But wouldn’t that have the outer edge of the lace border be on the inside edge of the blanket instead? I thought I might have to knit until I get to the second edge section and do row 1, and then on the next row do row 2 for that section and row 1 for the 1st border, and so on, but I’m not sure if that will work. Any ideas?

Yes, i think that would work. That is how I would do it.
An alternative would be to knit the border on last, Similar to how an attatched i-cord is added.
With this short row round blanket (probably do one colour)you could add the border on as you go.