My 6 weeks old LO did not pass motion for about 2 days. Not as frequent as she used to be. She seems alil cranky and not able to sleep peacefully too. Should i be worried about this?

Nope. It is normal for babies to poo every few days or so. She could be having colic, aside from being cranky how else does she act? They could also be overtired, babies at 6 weeks are constantly changing. We need to keep adapting.