Neosure & Constipation

girlmomx3
My breast milk supply has been sadly decreasing since we've been home from NICU. I've had to give more formula (Neosure) than breast milk unfortunately. This has made her constipated to where she's crying in pain trying to go. Any remedies to help with the constipation. She is 1 month old, 37 weeks adjusted. TIA!