Do these untie or are they just stretchy/elastic?
they are very stretchy.

Will these fit a newborn?
Yes suitable for 0-6 years.

Washing way
Hand washing.

Do these leave marks on your babies head?
The material is soft and very strechy,no worry about this problem.

Are they easy for the babies to pull off?
Yes they are easy for a child to pull off if they feel uncomfortable.

Flower Size:3in (Diam) Band Size:0.7in(Width)*14in(Girth)

• Perfect hair accessories for baby photography,everyday wearing,gift.
• The material of the hair tie is fabric cloth,soft,prevent from hurting baby skin
• Big fashion flower design, sure to catch your eye!
• 14 inch Girth ,good elasticity,perfect for any girl, newborn, baby, toddler, or mommy.
• Package Include: 12pcs Headbands (different colors)

Perfect hair accessories for baby photography,everyday wearing,gift.