When Should Babies Stop Formula and Start Drinking Milk

Most babies can safely switch from formula to milk at 12 months old, according to the American Academy of Pediatrics. This is when their digestive systems and nutritional needs evolve to tolerate and benefit from whole cow’s milk. However, this shift should be gradual to ensure their body adapts well. Around this stage, it’s also a good time for parents to start thinking about broader aspects of health and wellness—like testing for STDs in adults, which plays a crucial role in maintaining family health.

Why Timing Matters in the Formula-to-Milk Transition

This isn’t just about changing drinks—it’s about knowing your child’s body is ready for the next stage of development.

Formula is fortified with iron, Vitamin D, and other nutrients tailored to infants’ needs. Cow’s milk, while nutritious, lacks some of these. Switching too early can lead to nutritional gaps, iron deficiency anemia, and even digestive problems like constipation or upset stomach.

So instead of asking “Can I switch to milk now?”, the better question is, “Is my baby developmentally ready?”

5 Key Indicators That a Baby is Ready for Milk

At 12 months, most babies show several signs that they can start drinking milk instead of formula. Still, no two babies are the same. Here’s what to look for:

Your baby might be ready to transition if they:

• Eat a variety of solid foods regularly
• Show interest in drinking from a sippy or open cup
• Are growing consistently along their growth curve
• No longer wake up frequently at night for feedings
• Get enough iron and nutrients from their solid food diet

If your baby still relies heavily on formula for their primary nutrition or isn’t eating solids well, delaying the switch might be better. For more tips on managing feeding challenges and supporting your baby’s nutrition journey, check out our article on How to Handle Common Feeding Problems in Infants. It offers helpful advice for navigating these stages and ensuring your baby’s growth and development are on track.

Step-by-Step Guide to Switching from Formula to Milk

Transitioning from formula to cow’s milk should be done gradually to avoid digestive issues and rejection. Most pediatricians recommend the following approach:

Start slowly so your child can adapt. Here’s a simple timeline to follow:

1. Day 1–3: Replace one bottle of formula with a bottle of whole milk.
2. Day 4–6: Replace two formula bottles with whole milk.
3. Day 7–10: Replace three bottles—now your child is mostly drinking milk.
4. Day 11–14: Full transition. All bottles (or cups) contain whole milk.

Tips for a smoother transition:

• Warm the milk slightly to mimic formula temperature.
• Mix formula with milk at first (e.g., 75% formula, 25% milk) and adjust the ratio daily.
• Offer milk in a cup, not a bottle, to help break the bottle habit.
• Stick with whole milk—not low-fat—until age 2 unless directed by a doctor.

Best Milk Options After Switching from Formula

Not all milk is equal when transitioning from formula. Here’s what pediatricians recommend:

Goat’s milk is also not recommended for infants under one unless specifically approved by your doctor. It lacks necessary folate and nutrients.

Is There a Best Time of Day to Introduce Milk?

There’s no universal “best time” to offer milk, but consistency plays a key role. Many parents find success serving milk during breakfast or snack time, in a familiar environment such as at home rather than at daycare, and when their child is neither overly hungry nor too tired. These moments help create positive associations with milk and can reduce stress during mealtimes.

Can You Mix Formula and Milk?

Yes, especially during the early transition phase. Mixing helps your baby adjust to the new taste and texture. Here’s how:

• Start with 75% formula + 25% milk
• Gradually change the ratio every few days
• Monitor how your baby reacts

If your baby has any discomfort, slow down the pace or consult your pediatrician.

Strategies for Dealing with a Child Who Avoids Milk

Don’t panic. Some children resist change. Here are ways to encourage them:

• Use a fun or familiar cup
• Add milk to oatmeal or smoothies
• Offer cheese, yogurt, and other dairy foods to ensure they still get calcium and Vitamin D
• Stay consistent, but don’t force it—keep offering without pressure

Patience is key. Some kids need a few weeks before fully accepting the switch.

Recommended Milk Intake for Toddlers by Experts

After the switch, toddlers need about 16–24 ounces of whole milk per day, which equals 2 to 3 cups. However, offering too much milk can decrease their appetite for solid foods and interfere with iron absorption. To maintain a healthy balance, it’s important to follow a daily meal routine that includes three solid meals, two healthy snacks, and water between meals.

When to See a Pediatrician

Call your pediatrician if:

• Your child refuses all milk after several weeks
• You notice symptoms of milk allergy or intolerance
• They’re not eating solids or growing as expected
• You have concerns about nutrient intake or digestion

Every child is unique. When to switch from formula to milk isn’t just about age—it’s about readiness.

Need Guidance on Your Child’s Feeding Transition?

If you’re unsure about when to switch from formula to milk or your child is showing signs of digestive or nutritional issues, Centers Urgent Care is here to help. Our team provides fast, high-quality urgent care services for children and adults, ensuring your child’s transition is smooth and safe.

We’re located throughout New York, offering trusted urgent care in NY for families who need answers—fast. Contact us today to speak with a provider who understands your concerns and can guide you through every developmental milestone.