You are suffering from hormonal changes causing Telogen effluvium causing hair fall. It's completely stoppable even regrowth of hair is possible with certain medications without any side effects. Treatment depends on the grade of hair loss. So, it's a must for diagnosing which grade, you are in for an effective treatment. Please  send photos of your head, by direct online consultation for accurate diagnosis and proper treatment.

The technical name for this type of hair loss is telogen effluvium, which means excessive shedding. The hormone fluctuations that happen in women who are postpartum cause more strands of hair than usual to enter the resting stage and then fall out a few weeks later. Your hair should return to its usual growth patterns over time. By the time your baby is one year old, you can probably expect your hair to be as full as it usually is at the roots. However, the new hairs growing in will be shorter than the other hairs on your head. Medication is available to control the same. Consult with a Dermatologist for the same.