Is it normal a baby poop after feeding?

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My baby is now 14 months old, I noticed him after his 12 month shots he change the way he acts and mostly he poop every time after I feed him. He don't listen to me anymore, he is howling loud and scattered things anywhere. I don't see him play anymore but just scattering things around..if I ask him in a proper way to put things back he will just ignore me, If he want to do things he will do it if I stop him he will cry loud..then I sad: OMG! what happen to my baby.? He is not like this. I appreciate whatever suggestions or ideas you can share.!