Most babies are ready to start purees around 6 months of age. The World Health Organization, the American Academy of Pediatrics, and the CDC all point to this window as the time when breast milk or formula alone no longer meets a growing infant’s nutritional needs. But the calendar isn’t the only thing that matters. Your baby also needs to hit a few physical milestones before purees will actually work.
Why 6 Months Is the Target
Around the 6-month mark, two things converge. First, your baby’s body starts needing more energy and specific nutrients than milk alone can provide. Iron is the big one: babies are born with iron stores from pregnancy, but those reserves run low after about 6 months. Without iron-rich foods introduced at that point, the risk of iron deficiency rises significantly, especially between 9 and 24 months.
Second, your baby’s digestive system is more prepared for solid food at this age. Research from Johns Hopkins found that infants who started solids at or before 3 months showed significant changes in their gut bacteria, including higher levels of certain bacterial byproducts that persisted all the way to 12 months of age. Earlier studies have also linked starting solids before 6 months to a higher likelihood of childhood overweight. The takeaway: introducing purees too early doesn’t just fail to help, it can actively shift your baby’s gut development in ways that may carry consequences.
Developmental Signs Your Baby Is Ready
Age is a rough guide, but readiness is physical. Some babies hit these milestones a few weeks before or after the 6-month mark. The CDC lists these specific signs to watch for:
- Head and neck control. Your baby can hold their head steady and upright.
- Sitting with support. They can sit in a high chair or on your lap without slumping over.
- Interest in food. They open their mouth when you bring a spoon toward them, watch you eat, or reach for your food.
- Swallowing ability. They can move food to the back of their mouth and swallow it, rather than pushing it right back out with their tongue.
- Grasping. They bring objects to their mouth and try to grab small items.
That tongue-push reaction has a name: the extrusion reflex. It’s a built-in safety mechanism that prevents young infants from choking while nursing. It starts fading around 6 months. If your baby consistently pushes puree back out onto their chin, the reflex hasn’t disappeared yet, and they’re not quite ready. Give it a week or two and try again.
What to Start With
First purees should be very thin, almost the consistency of gravy. A common starting point is iron-fortified baby cereal mixed with breast milk or formula until it’s smooth and runny. From there, single-ingredient vegetable and fruit purees work well: sweet potatoes, squash, peas, carrots, applesauce, bananas, peaches, and pears are all standard first foods.
Start with just 1 to 2 teaspoons per sitting. This sounds tiny, but the goal at the beginning isn’t calories. It’s practice. Your baby is learning how to move food around their mouth, how to swallow something thicker than milk, and how to sit and eat from a spoon. Breast milk or formula remains the primary source of nutrition for months to come.
Once your baby gets comfortable with thin purees, you gradually thicken the consistency and introduce new ingredients. Between 6 and 9 months, you can add pureed or finely diced cooked meats, tofu, and mashed beans. By 9 to 12 months, most babies can handle small pieces of soft fruit and cooked vegetables alongside their purees, which is the natural bridge toward table food.
When to Introduce Allergens
Current guidelines have shifted dramatically on this topic. Rather than delaying common allergens, both the AAP and the Dietary Guidelines for Americans now recommend introducing foods like peanuts, eggs, dairy, wheat, soy, fish, and shellfish starting around 4 to 6 months, ideally while your baby is still breastfeeding or formula feeding. Research shows that introducing peanut, dairy, and egg in that early window actually lowers the risk of developing those specific allergies.
For babies with severe eczema or an existing egg allergy, the National Institute of Allergy and Infectious Disease specifically encourages introducing peanut-containing foods between 4 and 6 months. In these higher-risk cases, your pediatrician may recommend allergy testing before the first exposure. For most other babies, you can mix a small amount of smooth peanut butter into a puree (never give whole peanuts) and offer well-cooked scrambled egg in tiny portions as part of your normal introduction routine.
Reading Your Baby’s Hunger and Fullness Cues
Babies communicate clearly during feeding if you know what to look for. A hungry baby between 6 and 23 months will lean toward food, open their mouth eagerly, and try to grab the spoon or reach for what you’re eating. A full baby does the opposite: they close their mouth when food is offered, turn their head away, or push the spoon back. Some babies use hand motions or sounds to signal they’re done.
Respecting these cues matters more than finishing a specific amount. Forcing extra spoonfuls when your baby is turning away teaches them to override their own fullness signals, which can set up unhealthy eating patterns later. Some meals your baby will eat two teaspoons, others six. Both are fine. The consistency of offering matters more than the quantity consumed at any single sitting.
Why Waiting Too Long Is Also a Problem
While most of the conversation focuses on not starting too early, delaying purees well past 6 months carries its own risks. The WHO notes that if complementary foods aren’t introduced around 6 months, an infant’s growth may falter. Iron deficiency becomes increasingly likely the longer you wait, since breast milk contains very little iron and your baby’s built-in stores are depleting. There’s also a developmental window for learning to accept new textures. Babies who don’t practice chewing and swallowing thicker foods during the 6-to-9-month range sometimes have more difficulty accepting varied textures later on.
The practical sweet spot for most families is right around 6 months, adjusted a few weeks in either direction based on your individual baby’s readiness signs. If your baby is showing all the developmental markers at 5 and a half months, that’s a reasonable time to offer a first taste. If they’re still pushing everything out with their tongue at 6 months, waiting another couple of weeks is perfectly fine.