Approximately 5.5-6 inches.
Available on nylon headband or clip.
Nylon comes in 2 sizes, Normal nylon fits newborn and up (will vary on babies head size). I have reps over a year old that still use this size nylon. Stretchy (xl) nylon fits up to a child and most switch around 6 months or so unless baby has a smaller head.
TAT is approximately 2 weeks, but usually ships sooner.
Shipping is free if you spend $25 or more.