3 week constipation

an

My baby is gonna be one month on Thursday. And we’ve been struggling with pooping. She has one major blowout a day and that’s it. But the process to this blowout is so sad. She pushes and pushes. And screams and turns red. She is on formula she is on similac sensitive for gas and lactose and tolerant. She eats really good and her diaper is constantly wet. But she just has a hard time pooping. What can I do to help her not have to go thru such a painful process to have a dirty diaper. And is it normal to have one blowout a day and nothing else. Or should there be more poopy diapers? And I already use gas drops. First time mom. TIA💕