How much milk should a newborn drink per day?

Newborns (0-2 months) typically need 150-180 ml of milk per kg of body weight per day. For example, a 3.5 kg (7.7 lb) newborn would need approximately 525-630 ml (18-21 oz) daily, divided across 8-12 feedings.

How do I calculate how much milk my baby needs?

To calculate your baby's milk needs: 1) Weigh your baby in kg or lbs, 2) Determine the ml/kg/day based on age (0-2 months: 150-180 ml/kg, 2-6 months: 120-150 ml/kg, 6-12 months: 100-120 ml/kg), 3) Multiply weight by the rate, 4) Divide by number of daily feedings for per-bottle amounts.

How many ounces should a 3 month old drink?

A 3-month-old baby typically drinks 4-6 ounces (120-180 ml) per feeding, with 5-6 feedings per day. This equals roughly 24-32 ounces (700-950 ml) daily. The exact amount depends on your baby's weight - use our calculator for a personalized recommendation.

Is this calculator accurate for both formula and breast milk?

Yes, this calculator works for both formula and expressed breast milk. The recommended intake volumes are based on general pediatric guidelines that apply to both types of feeding. However, breastfed babies may feed more frequently with slightly smaller volumes.

How often should I feed my baby?

Newborns typically feed 8-12 times per day (every 2-3 hours). By 2-3 months, this usually decreases to 6-8 feedings. By 6 months, most babies feed 5-6 times daily. Always follow your baby's hunger cues and consult your pediatrician.

What if my baby drinks more or less than the calculated amount?

The calculated amounts are guidelines, not strict rules. Some babies naturally drink more or less. Signs your baby is getting enough milk include: 6+ wet diapers daily, steady weight gain, content after feedings, and meeting developmental milestones. Always consult your pediatrician if concerned.

Formula vs Breast Milk: What Parents Need to Know

The decision about how to feed your baby is deeply personal. Whether you breastfeed, formula-feed, or do a combination of both, you are giving your baby what they need to grow and thrive. This guide provides an evidence-based, judgment-free look at both options to help you make the choice that works best for your family.

Nutritional Comparison

Both breast milk and modern infant formula provide the essential nutrients babies need for healthy growth and development. Here is how they compare:

Nutrient	Breast Milk	Formula
Protein	Whey-dominant, easy to digest	Adjusted to mimic breast milk ratios
Fat	Varies with feed; rich in DHA/ARA	Vegetable oils with added DHA/ARA
Carbohydrates	Lactose + human milk oligosaccharides	Lactose (some include prebiotics)
Iron	Lower amount, but highly bioavailable	Fortified to meet daily needs
Antibodies	IgA, white blood cells, enzymes	Not present
Vitamin D	Supplementation recommended	Fortified in formula

Benefits of Breast Milk

Research has identified several advantages associated with breastfeeding:

Immune protection: Contains antibodies (IgA) that help protect against infections, particularly gastrointestinal and respiratory illnesses
Digestibility: Breast milk proteins form smaller, softer curds in the stomach, making them easier to digest
Dynamic composition: Changes throughout the day and as your baby grows to match their evolving needs
Reduced risk: Associated with lower rates of ear infections, eczema, and some childhood illnesses
Maternal health: Breastfeeding is linked to faster postpartum recovery and reduced risk of certain cancers
Cost: Free, though pumping equipment and accessories can add up

Benefits of Formula

Formula feeding also offers meaningful advantages for families:

Measurability: You can see exactly how much your baby is eating, which many parents find reassuring
Shared feeding: Any caregiver can feed the baby, supporting bonding with partners and family members
Flexibility: Easier to manage in public, during travel, or when returning to work
Consistency: Nutritional content does not fluctuate with the parent's diet or health
Medical necessity: Essential for babies whose mothers cannot breastfeed due to health conditions or medications
Maternal well-being: Can reduce the stress and physical demands associated with exclusive breastfeeding

Combination Feeding: Both Is Okay

Many families choose to combine breast milk and formula, and this is a completely valid approach. Combination feeding (sometimes called mixed feeding) can look different for every family:

Breastfeeding during the day and using formula at night
Formula while at work and breast milk during evenings and weekends
Supplementing with formula when breast milk supply is insufficient
Gradually transitioning from breast milk to formula

If you plan to combination feed, it is generally best to wait until breastfeeding is well established (usually 4-6 weeks) before introducing bottles, though this is not always possible. A lactation consultant can help you create a plan that works.

How Feeding Amounts Differ

One of the most practical questions parents have is whether amounts change based on the feeding method:

Breast Milk

Intake stays fairly stable at 750-800 ml/day from 1-6 months
Babies self-regulate well; overfeeding is rare
Composition changes rather than volume increasing
8-12 feeds per day in early weeks; 5-8 later

Formula

Intake gradually increases as baby grows
General guideline: 150 ml/kg/day in first months
Maximum typically 900-1050 ml/day (30-35 oz)
6-8 feeds per day in early weeks; 4-6 later

Our milk intake calculator can give you personalized amounts for both breast milk and formula based on your baby's weight.

Cost Considerations

Budget can play a role in feeding decisions. Here is a realistic look at costs:

Breastfeeding: Free at the breast, but may involve costs for a pump ($0-$300+), bottles, nursing bras, breast pads, and possibly lactation consultations
Formula: Ranges from $100-$300+ per month depending on brand and type (standard, sensitive, specialty). Also requires bottles and sterilizing equipment
Combination feeding: Costs fall somewhere between, depending on the ratio of breast milk to formula

Making the Right Choice for Your Family

There is no single "right" way to feed your baby. The best feeding method is the one that:

Keeps your baby nourished and growing well
Supports your physical and mental health as a parent
Fits your family's lifestyle and circumstances
Feels sustainable for the duration you choose to do it

If breastfeeding is not possible or not the right choice for you, your baby will thrive on formula. If you breastfeed exclusively, that is wonderful too. If you mix the two, your baby benefits from both. What matters most is that your baby is fed, loved, and growing.

For more on reading your baby's hunger and fullness cues, see our guide on signs your baby is getting enough milk. And for age-specific feeding amounts, check our feeding schedule by age guide.

Calculate Your Baby's Milk Intake

Whether you use breast milk, formula, or both, find out how much your baby needs per feed and per day.

Open Milk Calculator

Medical Disclaimer: This guide is for informational purposes only and does not constitute medical advice. Consult your pediatrician or a lactation consultant for personalized guidance on feeding your baby. Every baby and family situation is unique.

Frequently Asked Questions

Is formula just as good as breast milk?

Formula is a safe, nutritionally complete food that supports healthy growth and development. While breast milk has unique immunological properties that formula cannot replicate, modern formulas are carefully designed to match breast milk's nutritional profile as closely as possible. Both options produce healthy, thriving babies. The best choice is the one that works for your family.

Can I mix breast milk and formula in the same bottle?

Yes, you can mix breast milk and formula in the same bottle. Prepare the formula with water first according to package directions, then add the breast milk. Do not use breast milk in place of water to mix formula powder, as this creates an overly concentrated feed. Some parents prefer to offer breast milk first and then follow up with formula if the baby is still hungry.

Does my baby need different amounts of formula vs breast milk?

Yes, amounts can differ slightly. Breastfed babies typically consume 750-800 ml (25-27 oz) per day from 1-6 months and self-regulate intake well. Formula-fed babies may gradually increase intake as they grow, often following the 150 ml/kg/day guideline. Use our calculator for personalized amounts based on your baby's weight and feeding type.

How do I know if combination feeding is working?

Signs that combination feeding is going well include steady weight gain along your baby's growth curve, 6 or more wet diapers per day, a content baby after feeds, and no signs of digestive discomfort. Your pediatrician can help monitor your baby's growth and confirm that their nutritional needs are being met with your chosen feeding approach.