I'm so sorry for your friend's loss - how absolutely heartbreaking.
I just picked up
Soaring by Fhung Lie. It is not a memorial kit, but I found myself thinking that the beautiful wing elements would work for scrapping angel babies.
I have
Cherished Memories which is a memorial kit, but not specific to babies.
Sue Jones at Digitals has a poignant and beautiful set of
word art for such a tragedy. Everytime I read them I tear up.
Here are some others you can look through
Precious Angel Memories - Pink by Kim Broedelet
These are not specific to your topic, but the softness and understanded beauty of the kits might make them work for you.
Precious Moments by Doris Castle
Secret Garden
Papers and
Elements by Diamante Designs
Dreamer
Papers and
Elements by Vera Lim