Rainbow baby tattoo

Okay so I want to get a tattoo for my baby now and the baby I lost. I was thinking of getting this and doing the semicolon in a rainbow color. Or his fingerprints in a rainbow color. Which one do you think would look better? Or if you have any other suggestions let me know im open to other ideas.

Also I do not know what the gender of the baby I lost was. If I did I would have incorporated it in somehow