Most babies start needing less formula around 6 months, when solid foods enter the picture, and gradually taper down until formula is fully replaced by whole cow’s milk after their first birthday. The shift isn’t a single event but a months-long process where solids slowly take over more of your baby’s daily calories while formula remains the nutritional backbone until age 1.
The 6-Month Starting Point
Formula reduction begins indirectly. Around 6 months, your baby starts eating solid foods, and those calories begin displacing small amounts of formula. You’re not actively cutting bottles at this stage. Instead, you’re adding solids and letting your baby’s appetite naturally guide how much formula they want. Early on, solids are more about practice than nutrition, so formula still dominates.
Before offering solids, look for signs your baby is physically ready: sitting up with support, controlling their head and neck, opening their mouth when food is offered, and swallowing food rather than pushing it back out with their tongue. Most babies hit these milestones between 4 and 6 months, but the CDC recommends starting solids around 6 months.
How Formula Volume Changes From 6 to 12 Months
Between 8 and 9 months, most babies drink about 6 to 7 ounces per feeding, spaced every 3 to 4 hours, for roughly 4 to 6 feedings a day. By 10 to 12 months, feedings stretch further apart (every 4 to 6 hours), and babies typically drop to 3 or 4 bottles a day while still drinking 6 to 7 ounces each time.
Between 8 and 12 months, your baby needs about 750 to 900 calories per day. Of that, around 400 to 500 calories should still come from formula, which works out to roughly 24 ounces daily. The remaining calories come from solid foods. So even at 11 months, formula provides more than half of your baby’s energy. The reduction is real but gradual.
Let Fullness Cues Guide You
Rather than following a rigid schedule for cutting ounces, pay attention to how your baby signals they’ve had enough. Babies who are getting fuller from solids will naturally show it during bottle feeds. Signs of fullness include closing their mouth, turning their head away from the bottle, relaxing their hands, or pushing the bottle away. Your baby doesn’t need to finish every bottle. Pressuring them to drain it can override their natural ability to regulate intake.
Research on formula-fed infants suggests that encouraging babies to finish bottles even after they’re satisfied can lead to higher calorie intake than they need. Young infants in particular tend to drink to volume rather than to energy needs, meaning they’ll consume whatever amount is offered without adjusting for calorie density. As babies get older, they get better at self-regulating, but the habit of finishing bottles can interfere with that development. More than 25 studies have linked faster-than-normal weight gain in infancy to a greater risk of obesity, insulin resistance, and cardiovascular problems later in life.
Dropping Night Bottles
Formula-fed babies can generally phase out night feeds starting around 6 months. At that age, nighttime waking is unlikely to be driven by hunger. If your baby still takes a night bottle, look at how much they’re actually drinking. If it’s 2 ounces (60 ml) or less, you can stop the feed and use other settling techniques instead. If they’re drinking more than that, reduce the amount by about 20 to 30 ml every other night until you’re down to 60 ml, then drop it entirely. This process typically takes 5 to 7 nights.
Eliminating night feeds is one of the clearest reductions parents make, and it naturally shifts more of your baby’s formula intake to daytime, where it pairs better with a solid food routine.
Why Iron Matters as Formula Decreases
Formula is fortified with iron, so every ounce you reduce means less iron coming in automatically. Iron is critical for brain development during this period, and the CDC emphasizes introducing iron-rich foods as soon as your baby starts eating solids. Good sources include pureed meats, beans, lentils, and iron-fortified baby cereals. Pairing these with vitamin C-rich foods (like mashed strawberries or small amounts of orange) helps your baby absorb more iron from plant-based sources.
This becomes especially important between 9 and 12 months, when some babies are enthusiastic eaters and their formula intake drops faster. If solids are replacing formula calories, those solids need to pull their nutritional weight.
The Switch to Whole Milk After Age 1
The full transition off formula typically happens after your baby’s first birthday. Some babies who are eating a nutritionally balanced diet of solids settle into less formula between 9 and 12 months, and that’s fine, but formula (or breast milk) should remain part of the diet until age 1.
Once your baby turns 1, you can begin replacing formula with whole cow’s milk. The Cleveland Clinic recommends whole milk until age 2 unless your pediatrician advises otherwise. The daily target for cow’s milk is 16 to 24 ounces (2 to 3 cups). Drinking more than that can crowd out solid foods and lead to iron deficiency, since cow’s milk is low in iron.
Two Ways to Make the Switch
If your baby takes to cow’s milk easily, start offering 2 to 4 ounces of milk for every two or three servings of formula. Over the course of a week or so, increase the milk servings while decreasing formula until the transition is complete.
If your baby resists the taste, mix a small amount of cow’s milk into prepared formula. In a 4-ounce bottle, for example, try 3 ounces of formula and 1 ounce of milk. Gradually increase the milk ratio over several days as your baby adjusts. Continue until the bottle is entirely milk. The key is adding milk to already-prepared formula, not mixing it with dry powder.
A Practical Timeline
- Around 6 months: Introduce solids while maintaining your baby’s full formula schedule. Consider phasing out night feeds if your baby is waking but not truly hungry.
- 8 to 9 months: Expect 4 to 6 formula feedings per day at 6 to 7 ounces each. Solids are becoming a meaningful part of the diet but formula still provides the majority of calories.
- 10 to 12 months: Feedings drop to 3 or 4 per day. Aim for around 24 ounces of formula daily, with the rest of your baby’s 750 to 900 calories coming from a variety of solid foods rich in iron, healthy fats, and protein.
- After 12 months: Begin transitioning from formula to whole cow’s milk, keeping total milk intake between 16 and 24 ounces per day.
Throughout this process, your baby’s appetite is your best guide. Some weeks they’ll want more formula and less food, especially during teething or illness. Other weeks they’ll barely finish a bottle because they’re devouring solids. Both patterns are normal as long as the overall trend moves toward more food and less formula over the second half of the first year.