How to help my constipated LO

Hello Mummies! My LO is currently 2 months & 2 days old, premie.(Corrected age - 6 days old). On iron drops and is constipated. Went to the doctor, and the doctor gave probiotics and am also using Yuyee oil for baby, but it doesn't seem to help and is still constipated. Are there any home remedies that i can try to help my baby feel better? Thank you in advance!