Poop question

Jenna
breastfeeding my LO (8 weeks) exclusively. He has always had yellow seedy poop. Yesterday he had dark green and last night back to yellow but with pink mucus small streaks in it. Should I be worried? 
Looking it up online one source says it could be when intestine gets stuck inside other intestine. Although rare, my brother had this as a baby although not til about 7-8m and needed immediate surgery. 

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