The Emmazinggrace foundation is located in the Woodlands in the Houston area. They have recently received their 501(c)3 non-profit status from the IRS.
They are collecting burial gowns (knitted, sewn, crocheted) that they deliver to hospitals that need them.
I met Candy, the founder of emmazinggrace through our group at www.lucybug.org
Lucybug does not accept donations directly, but has a list of a few organizations, including emmazinggrace, that accept knitted items for preemies and/or for infant burial. Lucybug runs a blog where people can share pattern ideas and support for knitting for these tiny ones.
I know that there are no deadlines for items Candy receives. She gets calls from hospitals all over and tries to fill their needs anytime she can, so she is always looking for more items to fill these needs.