Newborn keeps forcing poop

Isabel
My 3 week newborn always tries to push her poop, like she gets all upset and cries when she forces it out but nothing comes out 
She's not constipated because she poops throughout the day
But I don't know what to do, she doesn't have to force her poop out, but she's always trying to
I push her legs up like doing the bycicle and stuff, and sometimes it helps but I don't know why she keeps doing this  
Oh and she's breastfeeding, thought I'd add that

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