Breast milk is the best milk for a newborn baby. The World Health Organization and UNICEF recommend exclusive breastfeeding for the first six months of life, starting within one hour of birth. When breastfeeding isn’t possible or a supplement is needed, commercially manufactured infant formula is the only safe alternative. No other type of milk, whether from animals or plants, is appropriate for a newborn.
Why Breast Milk Is the Top Choice
Breast milk is a living fluid that changes to match your baby’s needs. In the first one to five days after birth, your body produces colostrum, a thick, yellowish milk that is high in protein (about 14 to 16 grams per liter) and packed with immune-protective compounds that help prevent infections in the earliest days of life. Colostrum is low in fat because a newborn’s stomach is tiny and the priority is delivering concentrated immune support.
By about two weeks postpartum, your milk transitions to mature milk, which contains roughly 35 to 40 grams of fat per liter, nearly double the protein-adjusted energy of colostrum. This higher fat content fuels the rapid brain and body growth that happens in the first months. Breast milk also contains antibodies, enzymes, and beneficial bacteria that no formula can fully replicate. These components protect against ear infections, respiratory illness, and gastrointestinal problems while helping your baby’s own immune system develop.
The WHO recommends continuing breastfeeding up to age two or beyond, alongside solid foods introduced at six months.
When Formula Is Needed
Some parents can’t breastfeed, don’t produce enough milk, or choose not to for personal or medical reasons. In all of these cases, a commercially prepared infant formula provides complete nutrition that meets strict regulatory standards. In the United States, every infant formula sold must meet federal requirements for safety and nutritional adequacy before it reaches store shelves.
Most standard formulas are cow’s milk-based. The cow’s milk is heavily processed so that the protein, fat, and sugar ratios closely match what a newborn can digest. These formulas are required to contain specific amounts of essential fatty acids, folic acid, iron, and other nutrients. For example, regulations require that fat content falls between 3 and 6 grams per 100 kilocalories, and DHA (a fatty acid important for brain development) is now mandatory in formulas sold in European countries.
Goat milk-based formulas are also available and FDA-registered. Brands like Bubs, Kabrita, and Kendamil sell goat milk-based infant formulas with iron in the U.S. market. These are formulated to meet the same nutritional standards as cow’s milk-based options and can be a suitable choice if your pediatrician recommends one.
Formulas for Allergies and Sensitivities
About 2 to 3 percent of infants develop an allergy to cow’s milk protein. For these babies, extensively hydrolyzed formulas are the usual first-line option. These formulas break cow’s milk protein into very small fragments that are less likely to trigger an immune reaction.
Roughly 5 percent of babies with a cow’s milk allergy still react to hydrolyzed formulas. In those cases, amino acid-based formulas are recommended. These contain protein broken down to its simplest building blocks, making allergic reactions extremely unlikely. Amino acid formulas are also the go-to option for more severe conditions like anaphylaxis to cow’s milk protein, certain types of intestinal inflammation, or situations where a baby has multiple food allergies. Your pediatrician will guide you to the right formula type based on your baby’s symptoms.
Donor Human Milk
Pasteurized donor milk from an accredited milk bank is sometimes used for premature or hospitalized newborns when the mother’s own milk isn’t available. Accredited banks, such as those belonging to the Human Milk Banking Association of North America (HMBANA), screen donors for infectious diseases and safely collect, process, and store the milk.
The FDA recommends against obtaining breast milk directly from individuals or through the internet. Without proper screening, there is a risk of exposing your baby to infectious diseases (including HIV), drug residues, or bacterial contamination from improper storage. If you’re considering donor milk, work with your healthcare provider and use only a milk bank with formal safety protocols.
Milks That Are Not Safe for Newborns
Whole Cow’s Milk
Regular cow’s milk from the grocery store is not the same thing as cow’s milk-based formula. Whole cow’s milk has far too much protein and minerals for a newborn’s immature kidneys to handle efficiently. It also causes hidden intestinal bleeding in a large proportion of infants. In one study, the percentage of stools containing blood jumped from 3 percent at baseline to over 30 percent within the first 28 days of whole cow’s milk feeding. A heat-sensitive protein in unprocessed cow’s milk appears to be responsible for this bleeding. Infant formula is heat-processed specifically to eliminate this risk.
The high mineral load in whole cow’s milk also leaves very little margin of safety if a baby becomes dehydrated from illness, fever, or hot weather. Most guidelines recommend waiting until at least 12 months of age before introducing whole cow’s milk as a drink.
Plant-Based Milks
Almond milk, oat milk, rice milk, and soy milk from the carton are not appropriate for newborns or infants. These beverages are significantly lower in energy, protein, and fat compared to both breast milk and formula. Over 30 published cases of severe nutritional deficiencies, including rickets and failure to thrive, have been documented in children between 2.5 and 22 months old who were given plant milks instead of breast milk or formula.
It’s important to distinguish between plant milks (the carton beverages) and soy-based infant formulas. Soy infant formulas are specifically manufactured to meet all the nutritional requirements for infants and are a legitimate option when recommended by a pediatrician. A carton of soy milk is not the same product.
How to Tell Your Baby Is Getting Enough
Whether you breastfeed or use formula, diaper output is the simplest way to gauge whether your newborn is eating enough. On day one, expect around two wet diapers and three soiled diapers. By day four, you should see roughly five wet and four soiled diapers. By the end of the first week, the median is about seven wet and six soiled diapers per day.
Fewer than four soiled diapers on day four can be an early signal that your baby isn’t getting enough milk, particularly if your breast milk hasn’t fully come in yet. Steady weight gain after the initial post-birth weight loss (most newborns lose up to 7 to 10 percent of birth weight in the first few days) is the other key indicator. Regular weight checks at your pediatrician’s office during the first few weeks will confirm your baby is on track.