Beyond the Latch: The Emotional Impact of Breastfeeding & Weaning

The transition into parenthood often brings to mind images of peaceful nursing sessions and immediate bonds with your baby. But for many parents, the true reality of breastfeeding (and eventually, weaning) is complex. It’s an emotional rollercoaster shaped by a powerful, invisible force: your postpartum hormones. 

At MamaCare, we’re here to help you understand that pregnancy and postpartum mental health are largely shaped by hormones. If you’ve experienced a wave of unexpected highs or lows while nursing or weaning, you’re not alone. Understanding the biology of how these emotional shifts work is a powerful tool for reducing parenting stress, along with navigating the complex emotions of early parenthood. 

The “Feel Good” Hormones: Oxytocin and Prolactin

When you’re breastfeeding or pumping, your body produces the hormones oxytocin and prolactin, which serve the purpose of facilitating milk production and bonding with your baby. Let’s dive into the specifics:

• Oxytocin: Also known as the “love hormone”, oxytocin is released during skin-to-skin contact and the “let-down” reflex. This hormone promotes a sense of calm and increases feelings of connection. It can also play a role in countering postpartum anxiety, as it can lower cortisol (“stress” hormone) levels. (ParentData, 2026)

• Prolactin: The main roles of prolactin are to develop breast tissue during pregnancy and initiate lactation. Aside from its main functions, it also has a sedative/calming effect, which may help you feel more attuned to your baby's needs. (Cleveland Clinic, 2024)

This hormonal flow is meant to naturally provide a protective “layer” of hormonal postpartum support. However, the balance between oxytocin and prolactin is quite delicate. If nursing is painful or if you’re struggling with a low supply, the resulting stress from these situations can inhibit these two “feel-good” hormones. This clash of hormones can potentially contribute to heightened emotions of frustration and sadness, or more serious postpartum mental health challenges such as postpartum anxiety (PPA) or postpartum depression (PPD). 

When the Let-Down Feels Heavy: Understanding D-MER

It’s important to acknowledge that not everyone experiences joyous feelings during nursing. Some mothers experience Dysphoric Milk Ejection Reflex (D-MER). D-MER symptoms can be characterized by a sudden/brief wave of intense negative emotions (such as sadness, anxiety, irritability, etc.) that occurs right before and/or after the milk ejection reflex ("let-down”). (ParentData, 2026)

If this sounds familiar to you, please know that it is a physiological (bodily) not psychological (mental) response. D-MER occurs due to a sudden drop in dopamine (the “reward” hormone) during the milk ejection reflex. 

D-MER is a bodily process and a reflex of the nervous system. Though it's a challenging emotional sensation, it’s not a reflection of your bond with your baby or your capabilities as a parent. 

The Weaning Transition

The emotional impact doesn’t end when the nursing sessions do. Many parents find the process of weaning to be just as, or sometimes more, emotionally taxing as the early weeks of parenthood and nursing.

As you reduce the number of feedings, the steady supply of the hormones oxytocin and prolactin begins to decrease. This hormonal dip can trigger what’s often called “Post-Weaning Depression”, as your body is withdrawing from the constant supply of “feel-good” hormones. This shift can lead to irritability, anxiety, and a sense of melancholy (persistent sadness with no obvious cause).

As these symptoms can mirror the “baby blues”, they may be brushed under the rug. If you find yourself struggling with these heavy emotions or thinking, 'I hate my life after having a baby,' it may be a sign that your body is navigating a significant hormonal change that requires dedicated new parent support, as we provide at MamaCare. 

The Identify Shift

Beyond the chemical/hormonal changes, there’s an emotional weight of the changing dynamic that comes with weaning. You may feel a sense of grief as your baby transitions toward a new phase of independence. It’s undoubtedly exciting to see your child grow and hit new milestones, but at MamaCare, we’re here to support you through the feelings of sadness that may appear during this emotional transition.

Quick Tips for Supporting Your Mental Health During this Journey

• Wean Gradually: When/if possible, a “slow and steady” approach to weaning can allow your hormones to balance in smaller steps rather than abruptly all at once. This can minimize the severity of mood swings associated with weaning.

• Find New Rituals: It can be challenging to grieve the “closeness” you felt with your baby during nursing. Finding other ways to boost your oxytocin through connection, such as long cuddles or reading an extra book at bedtime, can be beneficial for both parents and children during this transition.

• Lean on Professional Support: If feelings such as sadness or anxiety persist for more than a few weeks—or if they feel unmanageable at any point—reach out to a postpartum therapist and seek support. At MamaCare, we’re here to help you navigate the emotional transitions of parenthood with expert-led, empathetic care.

You Don’t Have to Navigate This Alone

At MamaCare, we believe that your mental health is the foundation of your family’s wellness. From the first feeding to the final weaning session, MamaCare is here to support your emotional journey with compassion and expertise.

If you’re seeking postpartum support in Ontario, our team offers the evidence-based care you deserve to navigate these shifts. You’re doing an incredible job—let us help you feel like yourself again.

Book a Free Consultation Today: 

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References

Cleveland Clinic. (2024). Prolactin: What It Is, Function & Levels. https://my.clevelandclinic.org/health/body/prolactin

Parent Data. (2026). Hormones During Breastfeeding and Weaning     https://parentdata.org/pregnancy/hormones-during-breastfeeding-and-weaning/?st_source=ai_mode#:~:text=The%20myriad%20hormonal%20shifts%20can,within%20eight%20weeks%20of%20weaning