Extended Breastfeeding Myths & Benefits: What Breastfeeding Beyond 12 Months Actually Looks Like

If you’re breastfeeding beyond 12 months, you’ve probably heard something that made you question yourself. Maybe it was a comment from a family member, an offhand remark at a mother’s group, or something you stumbled across online. Whatever it was, it planted a seed of doubt about a choice that feels right for you and your child.

This article is part of the Nella Vosk Breastfeeding Nutrition & Milk Supply: Evidence-Based Guide for Australian Mothers — your complete resource for navigating the full feeding journey with confidence.

At Nella Vosk, supporting mothers through every stage of the feeding journey sits at the heart of our Milk & Feeding Support pathway — because knowing what is genuinely true about extended breastfeeding is the foundation for making an informed, unhurried decision about when and how to wean.

Extended breastfeeding generally refers to nursing a child beyond twelve months of age. The term is largely a Western cultural construct — globally, the average age of weaning has historically been closer to two to four years. The World Health Organization recommends breastfeeding up to two years and beyond, alongside complementary foods. The Australian Breastfeeding Association supports this position.

Whether extended breastfeeding is right for you depends on your individual circumstances, your child’s needs, and your own wellbeing — not on a cultural norm or an arbitrary milestone. What matters is that the decision is informed and free from misinformation.

Myth 1: Breast milk loses its nutritional value after 12 months

This is perhaps the most persistent myth — and one of the most clearly contradicted by the research. Breast milk does not have an expiry date. The body cannot “tell time”; it continues producing nutritionally complex milk as long as milk is being removed.

Research has found that breast milk in the second year of life contains significantly higher concentrations of certain immune factors, including lactoferrin, lysozyme, and immunoglobulin A, compared to earlier-stage milk. The nutritional composition shifts to meet the evolving needs of a growing toddler, while continuing to provide energy, essential fatty acids, and immunological support that complementary foods alone cannot replicate.

Breast milk in the second and third years still provides around 35–40% of a toddler’s energy needs on average, along with fat-soluble vitamins and long-chain fatty acids that may be lower in typical complementary foods.

Myth 2: Extended breastfeeding creates dependency and hinders independence

There is no evidence that extended breastfeeding damages a child’s psychological development or creates unhealthy dependency. The American Academy of Pediatrics, the Academy of American Family Physicians, and the World Health Organization all state that there is no evidence of psychological or developmental harm from breastfeeding into the third year of life or beyond.

Research into attachment suggests that secure, responsive parenting — which breastfeeding can support — is associated with healthier emotional regulation and greater independence over time, not less. Children wean naturally when developmentally ready, in the same way they transition from other forms of nurturing comfort.

Myth 3: You can’t get pregnant while breastfeeding

This myth sits at the other end of the spectrum and is worth addressing because it creates real risk. While breastfeeding does suppress ovulation through elevated prolactin levels — a phenomenon known as lactational amenorrhoea — this is not a reliable form of contraception beyond the first six months under very specific conditions.

As feeding frequency decreases (which often happens naturally as solids are introduced and the toddler becomes more mobile), prolactin levels fall and ovulation can resume, sometimes before a period returns. If avoiding pregnancy is important, discuss contraception with your GP or midwife. The 

For more on how lactation interacts with hormones and nutrition, the breastfeeding nutrition and milk supply guide covers the physiological context in full.

Myth 4: Breastfeeding a toddler is embarrassing or inappropriate

This is a cultural narrative, not a medical or psychological one. In the majority of human cultures across history, breastfeeding into toddlerhood has been entirely normal. In many parts of the world it still is.

The discomfort some people express about extended breastfeeding reflects social norms, not evidence about harm. Social stigma is real, however — research has found that 44% of mothers breastfeeding past 12 months report experiencing social stigma, and 61% past 24 months. This stigma is one of the most commonly cited barriers to extended breastfeeding, and it causes genuine isolation for many families.

The decision to continue or stop breastfeeding belongs to the mother and child — not to extended family, social media, or bystanders.

Myth 5: Extended breastfeeding will ruin your milk supply for a future pregnancy

Breastfeeding during a subsequent pregnancy and tandem nursing (feeding two children simultaneously) are both physiologically possible for most mothers, though they require careful nutritional support. Milk supply typically decreases during pregnancy due to hormonal shifts, which may lead some toddlers to self-wean. This is normal and not a sign of harm to either child.

If you’re managing supply while navigating a new pregnancy, maintaining nutritional intake becomes particularly important. The guide to 10 evidence-based ways to support your milk supply covers the foundations.

Myth 6: If your toddler has teeth, you should stop breastfeeding

Teeth are not an indicator of when breastfeeding should end. Babies begin teething from around four to seven months, while WHO recommends continuing breastfeeding to at least two years. The mechanics of breastfeeding — in which the tongue draws milk through suction rather than biting — make it entirely compatible with teeth, once a proper latch is maintained.

Biting during breastfeeding can occur, particularly when a baby is teething or distracted, and it is manageable with guidance. If it is a persistent challenge, a lactation consultant can help identify what is happening and offer practical strategies.

Myth 7: Extended breastfeeding means your milk is making your child unwell

Breast milk does not cause illness. If a breastfed toddler is unwell frequently, breastfeeding is not the cause — and may in fact be helping. Breast milk continues to provide immunological components including secretory IgA and lactoferrin that support immune function. Research consistently shows that breastfed children have lower rates of ear infections, gastrointestinal illness, and respiratory infections compared to non-breastfed peers, and this protective effect does not simply switch off at twelve months.