11 month old have BM issues..help!?

My son is 11 months old. He has been transitioning to finger foods but it has been hard because he had a texture adversion and gagging issues.. But he is still on 3...8 oz bottles a day of formula..and some finger foods and some baby food to supplement his food. In the past couple of weeks his bm's have small firm round balls. For a couple of days they were very big hard and he would cry while he was trying to poop..I have been giving him baby food prunes, bran, juice..all types of foods suggested for constipation and keeping him away from bananas, cheese etc..but it doesn't seem to make him poop more. He also just got his 1st molar on bottom left so I don't know if this is causing some issue...I am so lost and confused because he seems like the poop is painful and when it is small turds it is not much like the size of a couple peas...I don't know what else I can do I before had given him prunes and got huge poops but this time even though I have given him prunes a few days ina row I am seeing no change...what can I do? I spoke to dr before about his bm's and he said give prunes. Is this normal I know their bm's change with more solids but for him not to poop much at all is very different and may be causing him pain. Help please