Lower back pain, with a small baby can be due to deficiencies of Vit D and
Calcium and posture related.
The back and lower abdomen pain together with abnormal vaginal discharge could signify infection.
Next Steps
You’ll need some tests for urine infection, genital infection and a pelvic ultrasound to rule out uterine pathology. Increase your fluid intake, maintain hygiene with vaginal wash till tests are done
Health Tips
If you’re not using contraception since last few months rule out an abnormal pregnancy with a home based UPT.