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My PD told me yogurt actually causes constipation in babies, so does Asian bananas. The only bananas that don't cause constipation is the Del Monte bananas but babies cant eat too much of those as it is too cooling for them and causes phlegm buildup.
constipation advise
My 18m girl also used to have constipation issues. Yummymama, do you feed your girl alot of brown rice or apple sauce? Also, eating too much of high fibre foods like wholemeal breads, barley and cereals will also cause constipation if their digestive system is not mature enough to handle the fibre, esp if they're not drinking enough of water. Too much of juice is actually not good for them as it contains alot of sugars. Try encouraging them to drink more plain water. Alternatively, u can also boil nutritious soups for them to drink (eg, potato, carrot, tomato soup with loin pork/pork ribs/chicken thigh) if they don't like water so much.
You can try feeding your girl more nutritious fibrous vegetables like baby spinach, butternut squash and other cut fruits like honeydew, rock melon, prunes, peaches, etc. Don't give too much apples as they cause constipation. If your girl likes pears, give her the soft "ang mo" pears (not the chinese or korean pears as they are too cooling) like brown pears, packard pears.
LAstly, certain veggies also cause constipation if your girl's system is not mature enough to digest them, eg, broccoli, cauliflower, carrots.
Anyway, I believe every baby is different so you really have to observe your girl's poo. If her poo is hard after eating a certain food, or if u suspect certain foods give her constipation, stop feeding her that and see if the situation improves. I'm just speaking from my own experiences and now, I still monitor her poo everyday for signs of constipation. So far so good.