The photograph of a still born child or a older deceased infant/child was highly prized in the late 1800's and early 1900s. This is not new to our society.
If it provides comfort to the parents, who am I to judge if they should have such photos?
In the early days of photography, adults were often photographed in their coffins with members of the family gathered around; it was likely the only photograph ever taken of the deceased.
Amen, and God bless you for saying that.
In Victorian times, obituary photographs were fairly commonplace, and I believe it was as much as anything, a way of saying, "this beloved person was once one of ours, not to be forgotten."