SIL lost her baby after birth

Hey all.. I just wanted to see if anyone had any ideas of things that can be made or done to honor a baby who passed away days after birth? My sister in law lost her son and I want to do something for her that can let her remember him.. He didn't wear any clothes so there's no onsie to use. Didn't have a blanket or anything. We haven't announced his passing so not many brains to pick that I know. Thanks for any responses! She a strong woman but this will definitely take time to get through.