My 3 week old preemie seems to be constipated, she has been grunting and stiffening her limbs for 2 days now. I can't feel her abdominal area get extremely hard from her pushing but absolutely nothing comes out, I tried the cotton swab/ thermometer and it works almost everytime I did it. Ik it's normal for babies to not poop for a little while but she's getting frustrated and is barely sleeping can someone please help? She pushing so hard but nothing... if I didn't help she would've never pooped, I'm not sleeping at all and it hurts to watch her like this.. Any suggestion will be appreciated