Thank you so much for the suggestions!!!
I think I'm going go with a regular baby birth sampler. I haven't been able to find a pattern, prayer or poem for both. I don't want to let" perfect be the enemy of good" and end up not doing anything. I can't afford Mass but I will write out a sympathy card to go along with it. The death was expected
so I'm guessing they might already have something like the memory box. That is a great idea.
Thank you again everyone! :)