The primary reason behind postpartum hair loss lies in the hormonal changes your body undergoes during and after pregnancy. During pregnancy, elevated levels of oestrogen keep your hair in a prolonged growth phase, leading to thicker, more luscious hair. However, once you give birth, your oestrogen levels drop, causing the hair to enter the shedding phase, also known as telogen effluvium. This results in noticeable hair loss. And if you think about it, you have more hair to lose which is why it looks so drastic.