http://i.dailymail.co.uk/i/pix/2018/01/21/02/482C99C900000578-5293397-image-a-10_1516503450840.jpg
This photo was taken around 2 years ago as you can see the new baby in the mother's arms. I can't see severe malnutrition anywhere in the photo. It must have happened since this photo.
It looks like the oldest children are at the back and getting younger towards the front. The three girls at the front are obviously the youngest. Everyone is slender, or thin or skinny. The older girls have obvious breasts and are not "flat-chested". Many arms are visible and though slender don't appear bony. A lifetime of malnutrition often causes the hair to look bad, but their hair looks good if not great.
12-year-old has the weight of an average 7-year-old. This child is probably somewhere in the second row.
29-year-old daughter weighs 82 pounds. This girl (woman) is probably in the back row.