My 6 week old daughter has only pooped 2 times in the past 3 days. She pushes often, and it even makes the sound of her poop coming out.. but when I check the diaper there is only a "skid mark". She is breastfed, but I am not drying up, I still have a "letdown" every 45 minutes or so.. I lightly squeeze my breast and milk does squirt out still, and I can hear her swallowing. What can I do to help her? I tried stimulating with thermometer and it did not help.