What is causing leg and knee pain since delivery (my baby is now 6 months old)

Hi I had knee pain in the initial first three months after I gave birth. Ate glucosamine and tried to drink more milk. The condition became ok but then recently started to have knee strain again as my gal is crawling everywhere and I have to follow after her. The constant chasing her around and getting up and down plus bad posture when doing all these will aggravate the situation. We lose a lot of calcium during Pregnancy as baby is feeding on our calcium to develop their Bones. After delivery we need to replenish the Calcium. Also considering you are carrying baby a lot and bathing baby, all these will cause strains and pain

You seem to be lack of calcium, are u also breastfeeding? If so, you need to increase n loads on lots of calcium