Would normal milk cause runny poo?

I have a amazing baby boy who just turned one! I want to start weaning him slowly from the breast. He has never taken a bottle but will take small amounts of water in sippy cup. I gave him some milk ( maybe two ounces) the other night with about 4 oz of breast milk. Well, he had runny poop the next morning and was irritable and cranky for the past two days.. Do you think it's in relation to the milk or just coincidence? If it's the milk do you mammas have any other suggestions with what to replace with breast milk? I'm in no rush I just want to cut down to like three from five nursing a day. I am trying to get pregnant ASAP as well. Like by next month lol..

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