Major health organizations recommend exclusive breastfeeding for the first 6 months of life, then continued breastfeeding alongside solid foods for at least 2 years. That said, any amount of breastfeeding provides benefits, and the “right” duration depends on what works for you and your baby. Here’s what the evidence says about each stage.
The First 6 Months: Breast Milk Only
Both the World Health Organization and the American Academy of Pediatrics recommend that infants be exclusively breastfed for the first 6 months. “Exclusively” means no other foods or liquids, including water. Breast milk alone covers every nutritional need during this window, with one exception: breastfed infants should receive 400 IU of vitamin D daily, starting in the first few days of life, because breast milk doesn’t supply enough on its own.
This 6-month target is gaining traction globally. Nearly half of all infants under 6 months worldwide are now exclusively breastfed, an 8 percentage point increase since 2020 according to the Global Breastfeeding Scorecard.
6 to 12 Months: Adding Solid Foods
Around 6 months, your baby is ready to start solid foods while continuing to breastfeed. The signs of readiness are physical: your baby can hold their head up steadily, sit with some support, has roughly doubled their birth weight (at least about 13 pounds), and shows interest in food by watching you eat and opening their mouth when food comes near.
At this stage, breast milk doesn’t disappear from the menu. It remains a major source of calories, fat, and immune protection while your baby learns to eat. By 7 or 8 months, most babies can handle a variety of foods including vegetables, fruits, meats and other proteins, unsweetened yogurt and cheese, and whole grains like infant cereals. Cow’s milk as a drink should wait until after 12 months, though dairy products like plain yogurt are fine before then.
Think of solid foods during this period as practice and exploration. Breast milk is still doing much of the nutritional heavy lifting.
12 Months to 2 Years and Beyond
The WHO recommends continuing breastfeeding until at least age 2. Many parents wonder whether breast milk still “does anything” once a child is eating regular meals. It does, though its role shifts.
Research published in The Journal of Pediatrics found that breast milk beyond one year has slightly lower concentrations of protein, calcium, and certain fatty acids compared to milk at 3 months. But it remains a meaningful source of nutrition and hydration, especially when toddlers are sick, teething, or refusing other foods. The immune factors in breast milk actually increase in concentration during the second year of nursing. Because a child’s immune system doesn’t fully mature until around age 6, continued breastfeeding offers real protection during the toddler years. Breastfed toddlers tend to get sick less often, and when they do, they recover more quickly.
There are psychological benefits too. Toddlers navigating the frustrations of their expanding world often use breastfeeding as a source of comfort and security. Meeting those needs for closeness doesn’t delay independence. It builds the secure foundation from which children develop it.
Globally, continued breastfeeding at both the 1-year and 2-year marks has increased by roughly 10 percentage points in the last five years, suggesting this is becoming more normalized in many cultures.
What If You Can’t Breastfeed That Long?
The recommendations describe the ideal from a purely biological standpoint. Real life involves returning to work, supply challenges, pain, medication needs, mental health, and a hundred other factors. Breastfeeding for 3 months provides benefits. So does 6 months, or 9, or 18. The relationship between breastfeeding duration and health benefits is not all-or-nothing. Each week of breastfeeding contributes something.
If you stop before 6 months, your baby still received colostrum (the nutrient-dense first milk) and early immune protection during a vulnerable period. If you stop before 12 months, infant formula is the appropriate substitute until your baby’s first birthday, at which point whole cow’s milk or a fortified alternative can take over as the primary milk source.
How Weaning Typically Works
There’s no switch that needs to flip on a specific date. Most experts favor gradual weaning, where you slowly drop feeding sessions over weeks or months. Some children naturally lose interest as they eat more solid food and become busier exploring. Others continue to want the breast primarily for comfort at nap time or bedtime and gradually let go of those sessions last.
Baby-led weaning, where you follow your child’s cues rather than setting a hard stop date, tends to make the transition smoother for both of you. Abrupt weaning can cause breast engorgement and increases the risk of plugged ducts, so a gradual approach is easier on your body as well.
Vitamin D Throughout Breastfeeding
No matter how long you breastfeed, vitamin D supplementation remains important. Infants under 12 months need 400 IU daily. After their first birthday, the recommendation increases to 600 IU daily. This applies to all breastfed and partially breastfed children, regardless of how much sunlight they get, because breast milk simply doesn’t transfer enough vitamin D to meet a growing child’s needs.