From the description:

“If you have trouble wrestling your baby into her tights, these leg warmers provide an easy solution! Knitted in a cashmere-and-merino blend, they’re as comfy as they are cute.”

Finished Measurements:
7” (9.5”) long and 6” (7.5”) circumference

Published at Knit Picks as
Ultimate Baby Shower Gift: Leg Warmers

From the Knit Picks website:
These baby leg warmers are great for newborns who need to stay warm but don’t like the fussiness of tights.

Sizes: Preemie (0–6 months, 6–12 months)

Finished measurements:

Circumference:
4.75 (6.5, 8)“
12 (16.5, 20.5) cm

Length:
6.25” (7.25, 10)“
16 (18.5, 25.5) cm