It isn't "just in your head". It's biology.
During pregnancy, your body makes more estrogen and progesterone than at any other time in your life. These hormones also affect the brain chemicals that steady your mood.
After delivery, those hormones drop back to normal within about three days. At the same moment, your sleep is broken every two to three hours, so your stress hormone, cortisol, never gets a chance to settle.
This is why up to 8 in 10 mothers go through the "baby blues", and why about 1 in 5 mothers in India develop postpartum depression. It isn't weakness. It's a body under enormous change.

