Breastfeeding vs Formula Feeding: Advantages, Disadvantages, and the Nurse’s Role in the Feeding Decision

Introduction

Few decisions new parents make have as much lasting effect on a child’s health as how the baby is fed. Breast milk is a living, changing fluid that meets the needs of the human infant. Infant formula is a safe, regulated alternative for families who cannot or choose not to breastfeed. The World Health Organization (WHO) and the American Academy of Pediatrics (AAP) both recommend exclusive breastfeeding for about the first 6 months, then continued breastfeeding alongside complementary foods for 2 years or beyond (AAP, 2022; WHO, 2023).

Practice falls short of these recommendations. Globally, only about 48% of infants under 6 months are exclusively breastfed (WHO & UNICEF, 2023). In the United States, about 83% of infants start breastfeeding, but only about 1 in 4 is still exclusively breastfed at 6 months (Centers for Disease Control and Prevention [CDC], 2022). The large drop after birth shows why nursing support matters so much.

Breastfeeding compared with formula feeding

Breastfeeding: the gold standard for infant nutrition

Breast milk is called the gold standard because no formula can fully copy it. It is the reference against which every infant formula is measured.

• Made for each stage. Colostrum, produced in the first 2–5 days, is small in volume but rich in protein, antibodies and growth factors. It acts as the newborn’s “first immunization” and helps pass meconium. Mature milk then adjusts to the infant’s age, and milk for preterm infants is even higher in protein.
• Living immune protection. Secretory IgA coats the infant’s gut and protects against the specific germs the mother has been exposed to. Lactoferrin binds iron that bacteria need, and HMOs feed healthy gut bacteria such as Bifidobacterium.
• Balanced nutrition. Breast milk provides about 20 kcal per ounce, with lactose for energy, easily digested whey protein and long-chain fatty acids (DHA and ARA) for brain and eye development. Its iron is present in small amounts but is very well absorbed.
• Responsive feeding. The baby controls how much they drink, which may help them learn to regulate appetite and is linked to a lower risk of obesity later.
• Endorsed worldwide. WHO, UNICEF, AAP, ACOG and the Association of Women’s Health, Obstetric and Neonatal Nurses (AWHONN) all recommend breastfeeding as the best feeding choice for most infants.

Benefits to mother and infant

Benefits to the infant

• Fewer infections: lower rates of ear infections (otitis media), lower respiratory infections, and diarrhea and other gastrointestinal infections, with fewer hospital admissions.
• Lower risk of SIDS: breastfeeding is linked to a reduction of roughly a third or more in sudden infant death syndrome, and the protection is stronger with exclusive breastfeeding (AAP, 2022).
• Protection for preterm infants: human milk greatly lowers the risk of necrotizing enterocolitis (NEC).
• Long-term health: lower risk of childhood obesity, type 1 and type 2 diabetes, asthma and childhood leukemia.
• Development and comfort: some studies link breastfeeding to slightly higher cognitive scores. Skin-to-skin contact during feeds also helps regulate the newborn’s temperature, heart rate and blood glucose.

Benefits to the mother

• Faster recovery after birth: oxytocin released during feeds makes the uterus contract, which reduces postpartum bleeding and helps it return to its normal size.
• Lower long-term disease risk: breastfeeding lowers the risk of breast cancer, ovarian cancer, type 2 diabetes, hypertension and cardiovascular disease, and longer breastfeeding gives more protection.
• Natural birth spacing: the lactational amenorrhea method (LAM) is over 98% effective for up to 6 months, but only if the baby is exclusively breastfed and the mother’s periods have not returned.
• Bonding and wellbeing: oxytocin and prolactin support attachment and may help reduce stress.
• Practical savings: breast milk costs nothing, needs no preparation and creates no packaging waste.

Advantages and disadvantages of breastfeeding

When breastfeeding is not recommended: classic galactosemia in the infant, maternal HTLV-1/2 infection, untreated active tuberculosis (temporarily), active herpes lesions on the breast, use of illicit drugs, and certain medications such as chemotherapy. For mothers with HIV, U.S. guidance now supports shared decision-making for those who are on antiretroviral therapy with a sustained undetectable viral load (CDC, 2024).

Advantages and disadvantages of formula feeding

Formula is not a failure. For a mother who cannot breastfeed, has a contraindication, or makes an informed choice not to, iron-fortified infant formula prepared correctly is a safe way to support normal growth. Combination feeding (breast milk plus formula) is also a valid option, because any amount of breast milk benefits the infant.

Role of nurses in the feeding decision

Nurses are often the most trusted and most available source of feeding information, from the first prenatal visit to the weeks after discharge. Their role is to make sure the decision is informed, supported and free of judgment.

1. Prenatal education and assessment

• Begin feeding discussions early in pregnancy, and include partners and family, who strongly influence the decision.
• Assess factors that affect feeding: previous breastfeeding experience, breast surgery, medical conditions, medications, plans to return to work, cultural beliefs and support at home.
• Give accurate, evidence-based information on the benefits and challenges of both methods so the family can make an informed choice.

2. Support during the hospital stay (Baby-Friendly practices)

The WHO/UNICEF Ten Steps to Successful Breastfeeding guide nursing care in Baby-Friendly hospitals:

• Place the baby skin-to-skin right after birth and help start breastfeeding within the first hour.
• Keep mother and baby together 24 hours a day (rooming-in), and teach the mother to recognize early hunger cues such as rooting and hand-to-mouth movements.
• Avoid giving formula to breastfed newborns unless it is medically needed, and counsel families on the use of bottles and pacifiers.
• Assess latch and positioning with tools such as the LATCH score, and teach hand expression and pumping.
• Monitor adequacy: about 8–12 feeds in 24 hours, at least 6 wet diapers a day by day 5–6, and weight loss of no more than about 7–10% before birth weight is regained by around 10–14 days.

3. Problem-solving and referral

• Manage common problems early, including sore nipples, engorgement, low supply and jaundice. Refer to an International Board Certified Lactation Consultant (IBCLC) when problems are complex.
• Recognize warning signs such as poor weight gain, dehydration or signs of mastitis, and escalate care.
• Check medication safety with resources such as LactMed rather than advising mothers to stop breastfeeding unnecessarily.

4. Supporting formula-feeding families

• Respect the family’s choice and avoid guilt or pressure. Shame does not improve outcomes and can harm the mother’s mental health.
• Teach safe preparation: hand washing, safe water, exact measuring, cleaning bottles and discarding leftover formula after feeds.
• Teach paced bottle feeding, holding the baby close during feeds and recognizing fullness cues to prevent overfeeding.

5. Discharge, follow-up and advocacy

• Arrange a follow-up visit within 48–72 hours of discharge and connect families with peer support groups and WIC services.
• Educate mothers about their workplace rights to pump, such as the U.S. PUMP for Nursing Mothers Act (2022), and about safe milk storage.
• Provide culturally sensitive care and advocate for workplace, hospital and community policies that remove barriers to breastfeeding.

Conclusion

Breastfeeding remains the gold standard for infant nutrition. Breast milk changes to meet the infant’s needs, carries living immune protection, and benefits both the infant and the mother in the short and long term. Breastfeeding also has real challenges, including pain, time demands and difficulties returning to work. Formula feeding offers flexibility and shared feeding and is a safe alternative when breastfeeding is not possible, but it lacks breast milk’s immune and long-term protective benefits. Nurses are central to the feeding decision. They educate families before birth, support a strong start in hospital, solve problems early, teach safe formula use when it is chosen, and advocate for supportive policies, so that every family can feed their baby safely and with confidence.

References

American Academy of Pediatrics. (2022). Policy statement: Breastfeeding and the use of human milk. Pediatrics, 150(1), e2022057988. https://doi.org/10.1542/peds.2022-057988

Centers for Disease Control and Prevention. (2022). Breastfeeding report card: United States, 2022. U.S. Department of Health and Human Services.

Centers for Disease Control and Prevention. (2024). HIV and breastfeeding.

Victora, C. G., Bahl, R., Barros, A. J. D., França, G. V. A., Horton, S., Krasevec, J., Murch, S., Sankar, M. J., Walker, N., & Rollins, N. C. (2016). Breastfeeding in the 21st century: Epidemiology, mechanisms, and lifelong effect. The Lancet, 387(10017), 475–490. https://doi.org/10.1016/S0140-6736(15)01024-7

World Health Organization. (2023). Infant and young child feeding [Fact sheet]. https://www.who.int/news-room/fact-sheets/detail/infant-and-young-child-feeding

World Health Organization & UNICEF. (2018). Implementation guidance: Protecting, promoting and supporting breastfeeding in facilities providing maternity and newborn services – The revised Baby-friendly Hospital Initiative. World Health Organization.

World Health Organization & UNICEF. (2023). Global breastfeeding scorecard 2023: Rates of breastfeeding increase around the world through improved protection and support. World Health Organization.