Well, my mom was pregnant with me in 1960, and she was also thin like Stanley. Pregnancy clothes are pretty obvious to spot, although I get your point about Hawaiian clothes - but the shape can still show. But mainly - even though they were both pregnant around the same time - there are lots of photos of my mom obviously pregnant, in maternity clothes. I’m curious that a birth a year later doesn’t seem to have produced any photos. Most women are really proud of their being pregnant and want to commemorate it with photos.
Actually Ann had problems with her weight her entire life as her high school classmates mentioned and for a time it seems as though she hated her appearance when she had both braces and was overweight. If you think about it there are absolutely no photos of Ann after she left high school until she returns to HI with Jr. There are also no photos of an infant, the only baby photo of Jr which has been released is a professionally taken photo and Jr is the only one in it, I guesstimate his age in the photo as between 6 and 8 months old. The photo was released AFTER Madelyn Dunham’s death.
To take the matter of photos even further, how many first time grandparents could resist taking as many photos of their first born grandchild as possible if that grandchild lived nearby? I don’t think the Dunhams were proud of the fact that their daughter was pregnant especially when the father was a native Kenyan! Stanley Armour Dunham was so affected by what Ann had done that he mentioned to a co-worker in the 70’s that he had lived “Guess Who’s Coming to Dinner”.