Postpartum depression occurs shortly after delivery. Symptoms include sadness and hopelessness. Many new mothers experience mood swings and weeping bouts that quickly fade. They happen mainly due to hormonal changes resulting from the termination of pregnancy. However, some mothers experience these symptoms more intensely, leading to postpartum depression.
The main cause of postpartum depression is also the huge imbalance of postpartum reproductive hormones. In addition, sleep deprivation, isolation, inadequate nutrition, and lack of partner support can also potentiate these factors, making the mother feel unmotivated in life and neither have the strength to cope with the new routine, nor interact with the baby.
Anton's disregard for the entire speech of Callie after he concluded she is not a credible speaker because she is stumbled on some of her words is a clear barrier to listening. Callie still communicated good information but because Anton had concluded she isn't worth listening to, he had not listened and gotten the information Callie was passing.