<prompt> Nails are formed in which week of IUL ___0-6 week10-12 week14-18 week20-24 week  <response>: Around week 11, the nail beds the layer of cells underneath the fingernails and toe nails begin to form; then in the second trimester, tiny nails will sprout up. There;s nothing you can do to speed up, improve or impact the development of your little one;s skin, hair and nails. Reference: GHAI Essential pediatrics, 8th edition 