Anne Geddes Photography Interpretation Question

Hi! I was just wondering if there’s a message behind using babies with women who aren’t their moms in some of Anne Geddes’ photos. I remember learning about her in a high school photography class and just recently came across her instagram and was curious. To me, I’m just thinking, well that’s kind of weird. Wouldn’t you want to showcase the actual mother too? But I’m probably missing something. Let me know! :-)