The Benefits of Breastfeeding Beyond 12 Months

One of the most persistent myths about extended breastfeeding is that breast milk “becomes water” after a certain point, or loses its nutritional value. This is not supported by evidence.

According to WHO data, between 12 and 23 months of age, an average daily intake of around 500ml of breast milk still provides approximately 35–40% of a toddler’s total energy needs. It also remains a meaningful source of essential fatty acids, fat-soluble vitamins, and immune proteins that can be comparatively lower in typical complementary foods.

What this looks like in practice:

• Protein and fat: Breast milk in the second year contains significantly higher concentrations of immune-active proteins including lactoferrin, lysozyme, and Immunoglobulin A (IgA) than early-stage milk. Research published in the Journal of Human Lactation found that some immune factors actually increase in concentration as the toddler stage progresses.
• Vitamin A: Studies from Bangladesh have shown that breast milk continues to be an important source of vitamin A in the second and even third year of life for toddlers in food-insecure environments.
• Calories: A breastfeeding toddler who nurses several times a day is still receiving meaningful caloric support alongside their growing solid food intake.

The nutritional demands of lactation — including calorie needs, hydration, and key micronutrients — continue beyond the first year. Our guide to foods that support breastfeeding and milk production covers the evidence on what to eat to sustain supply through toddlerhood and beyond.

Immune protection is one of the most compelling reasons the research supports extended breastfeeding. The antibodies, white blood cells, and bioactive compounds in breast milk provide an active, adaptive defence system for your child — one that formula cannot replicate.

The immune picture after 12 months:

• Breastfeeding toddlers between one and three years of age have been found to have fewer illnesses overall, illnesses of shorter duration, and lower hospitalisation rates.
• A large Norwegian study found that infants breastfed for 12 months or more had a significantly lower hospitalisation risk compared with those breastfed for six months or less — with an adjusted relative risk of 1.22 for the shorter-breastfed group.
• IgA concentrations, which help protect mucosal surfaces in the gut, respiratory tract, and ears, remain elevated in breast milk well into the second year.
• The protective effect against ear infections (otitis media) and respiratory illness has been documented beyond the first year in multiple systematic reviews.

For Australian families navigating daycare, playgroups, and the inevitable parade of toddler illnesses, this immune support can be genuinely meaningful.

Research into the long-term neurodevelopmental effects of breastfeeding has produced some compelling findings, particularly for children breastfed to 12 months and beyond.

A large-scale analysis of more than 7,000 children conducted by researchers at Children’s Hospital Los Angeles and published in Nature Pediatric Research found associations between longer breastfeeding duration and positive brain development outcomes that could be traced up to ten years into childhood. Children breastfed for 12 months or longer showed higher grey matter surface area — associated with better performance on cognitive tasks — and healthier weight trajectories than shorter-breastfed peers. Notably, the researchers found these effects held across both higher and lower socioeconomic groups.

The mechanisms most likely driving cognitive benefit include:

• Long-chain polyunsaturated fatty acids (DHA and ARA), which remain present in breast milk and support ongoing myelination of the developing brain
• Hormones and bioactive factors including insulin-like growth factor, leptin, and adiponectin, which influence metabolic and neurological development
• The physical and emotional responsiveness of breastfeeding itself, which supports secure attachment and self-regulation

The benefits of extended breastfeeding are not one-directional. Mothers who breastfeed for 12 months or longer accumulate meaningful reductions in their own long-term health risks.

Cancer risk reduction: Breastfeeding for a cumulative 12 months is associated with a reduced risk of breast cancer. Crucially, this protective effect appears to roughly double for mothers who accumulate a lifetime total of two years of breastfeeding across one or more children.

Additional documented maternal benefits beyond 12 months of total breastfeeding include:

• Reduced risk of ovarian cancer
• Lower risk of type 2 diabetes
• Reduced risk of rheumatoid arthritis
• Lower incidence of cardiovascular disease and high blood pressure
• Extended natural child spacing (lactational amenorrhoea, though not a reliable contraception method)

These are population-level associations, not guarantees — individual health is influenced by many factors. But for mothers weighing up whether to continue, the cumulative effect on their own long-term health is genuinely worth knowing about.

As babies move into toddlerhood, feeding frequency naturally decreases. Your toddler is eating more solid food, sleeping longer stretches, and nursing less predictably. This shift can sometimes trigger concern about supply.

A few things worth knowing:

• Supply reduction as feeding frequency drops is normal and expected — your body is responding appropriately to decreased demand.
• Night nursing often continues into the toddler years and remains a meaningful part of supply maintenance for some mothers.
• If you want to sustain breastfeeding through toddlerhood, the principles of supply support remain consistent: frequent and effective milk removal, adequate nutrition and hydration, and managing stress.

Power pumping is one technique some mothers use when they want to increase or re-establish supply after a dip — our guide to power pumping and how it supports milk supply walks through the evidence and method in detail.

Hydration remains one of the most important daily factors in sustained milk production. Our article on electrolytes for breastfeeding and what actually matters covers what toddler-stage breastfeeding mothers should know about fluid and mineral balance.

It would be incomplete to cover extended breastfeeding benefits without addressing the dental health research. Multiple reviews have found that breastfeeding beyond 12 months — particularly at high frequency and at night — may be associated with a modestly increased risk of early childhood caries (tooth decay), especially when combined with other dietary factors like frequent sugar exposure.

This does not mean extended breastfeeding causes tooth decay. It does mean that dental hygiene practices matter from the time first teeth emerge.

Practical steps for breastfeeding toddlers:

• Brush teeth twice daily with a small amount of fluoride toothpaste appropriate for your child’s age
• Aim to brush after the last nursing session before sleep where possible
• Discuss your breastfeeding and dental hygiene routine with your child’s dentist at each check-up
• The overall benefits of breastfeeding beyond 12 months are broadly considered to outweigh the dental risk when good oral hygiene is maintained — this is reflected in the position of the Australian Dental Association alongside breastfeeding guidelines

For the full picture of breastfeeding nutrition through every stage — from the early days through toddlerhood — visit the Nella Vosk Breastfeeding Nutrition & Milk Supply: Evidence-Based Guide for Australian Mothers.

Breastfeeding Nutrition & Milk Supply Guide →

You may also find these related articles helpful:

• → Foods to increase breast milk supply: what the evidence says
• → Electrolytes for breastfeeding: what actually matters
• → Power pumping to support milk supply
• → Cluster feeding explained
• → Why Nella Vosk products are brewer’s yeast free