Combination Feeding: Supporting Families Without Judgment or Misinformation

By Birth & Baby University · Last updated: October 2026 · 8 min read

Plenty of families feed their babies both breast milk and formula. Some plan it, some arrive at it after a hard first week, and some need it because of work, medical advice or exhaustion. Professional guidance leans toward exclusive breastfeeding for about six months, and public conversation can leave parents who combine feeding feeling judged or misinformed. A postpartum doula has to hold two things at once: accurate information about what the research does and does not show, and respect for the family’s choices and circumstances. This article reviews the evidence on combination feeding, including trials and cohorts that point in different directions, and what supportive practice looks like.

Key takeaways

Quick answer: there is no single best way to combine feeding, and the evidence about whether early formula use harms breastfeeding is mixed. Observational studies link combination feeding with earlier breastfeeding cessation, but this does not show that formula caused it. A small trial found short-term benefit from limited early formula for infants with early weight loss, and a larger one found no benefit and possibly a lower rate of breastfeeding at 12 months. Families deserve accurate, non-judgmental help whichever way they feed.

• The AAP recommends exclusive breastfeeding for about 6 months, and also says babies can thrive on breast milk, infant formula or a combination, and that formula is a safe, nutritious choice for families who cannot breastfeed.
• In a small trial of 40 breastfed infants with early weight loss, 10 mL of formula after feeds until mature milk arrived was followed by 79% exclusive breastfeeding at 3 months versus 42% in controls. A later trial of 164 pairs found no improvement in breastfeeding at 6 or 12 months; at 12 months 29.6% of the formula group and 48.1% of controls were still breastfeeding.
• In an Irish cohort of 456 first-time mothers, those who combination fed were more likely to stop breastfeeding (relative risk 2.3 by 1 month and 12.0 by 2 months), but the authors point to early support for breastfeeding, not formula alone, as the likely lever.
• In an online survey of 845 breastfeeding mothers, guilt and dissatisfaction were higher among those supplementing with formula.

What the research says

What professional bodies say. The AAP’s Why We Support Breastfeeding page recommends exclusive breastfeeding for about 6 months if possible and continued breastfeeding for 2 years or beyond. In the same document it states that “babies can thrive on breast milk, infant formula or a combination of the two,” that there is no “right” or “wrong” choice, and that for families who cannot breastfeed, formula is a safe and nutritious choice. It also acknowledges that bias can discourage breastfeeding and calls for practical support. The ABM’s Clinical Protocol #3 (revised 2017) lists medical reasons for supplementation and says 10% weight loss is not an automatic marker for supplementation but an indication for evaluation. The ABM’s October 2024 position statement adds that when supplementation is recommended the order of preference is expressed mother’s own milk, donor human milk, then commercial formula, that the volume should match the baby’s approximate need, and that overfeeding and medically unnecessary supplementation are common responses to normal parental and infant behaviors. These documents describe goals and clinical indications. They do not conclude that mixing breast milk and formula is harmful in itself.

Trials of limited early formula. Flaherman and colleagues’ 2013 pilot trial randomized 40 exclusively breastfeeding term infants, aged 24 to 48 hours and having lost 5% or more of birth weight, to early limited formula (10 mL by syringe after each breastfeeding until mature milk production began) or continued exclusive breastfeeding. At one week, 10% of the formula group used formula compared with 47% of controls, and at three months 79% of the formula group were exclusively breastfeeding compared with 42% of controls. The authors suggested the approach might be a temporary coping strategy. The follow-up 2019 randomized trial in JAMA Pediatrics enrolled 164 pairs at two US medical centers, infants 24 to 72 hours old with weight loss at or above the 75th percentile whose mothers had not yet produced copious milk. At 6 months, 65% of the formula group and 77% of controls were breastfeeding (difference -12%, 95% confidence interval -26% to 3%, not significant), and at 12 months 29.6% versus 48.1% (risk difference -18%, 95% confidence interval -34% to -3%). After adjusting for marital status and intended duration, the hazard ratio for stopping was 0.74 (0.48 to 1.14). The authors concluded early limited formula was not associated with any improvement in breastfeeding duration in a population with high breastfeeding prevalence. The groups differed at baseline in some ways, and phone surveys measured outcomes. The two trials differ in size, population and outcome measure, so neither settles the question.

Cohorts and experiences. Hemmingway and colleagues’ Irish cohort (2020) followed 456 first-time mothers. Combination feeding was common at discharge (31%) and at 1 month (20%), reasons at 1 month included perceived or actual hunger (30%), healthcare professional advice (31%) and breastfeeding difficulties (13%), and combination feeders were more likely to stop breastfeeding (relative risk 2.3 by 1 month, 12.0 by 2 months). The authors interpret this as meaning that supporting early breastfeeding without formula may be key to continuation. Because mothers with breastfeeding difficulties may start formula and also stop breastfeeding, the association cannot show that formula caused the cessation. Komninou and colleagues (2017) surveyed 845 breastfeeding mothers online and found 15% felt guilty, 38% stigmatized and 55% felt the need to defend their feeding choice, with guilt and dissatisfaction higher among mothers supplementing with formula. The authors call for more balanced and realistic targets. The sample was self-selected through social media.

What this means for doulas

• Use accurate, even-handed language. “Exclusive breastfeeding for about six months is the recommended goal, and many families combine feeding for good reasons” matches the AAP.
• Do not claim that formula ruins breastfeeding. The trial evidence is split and the cohort association is confounded. Equally, do not promise that a little formula protects it.
• Ask why the family is supplementing. Medical advice, low weight, exhaustion, returning to work and parental preference call for different support. Where milk removal is a worry, the parent can discuss a plan with a lactation professional.
• Protect milk removal when breast milk is wanted. If a parent wants to maintain supply while using formula, the usual lever is removing milk regularly. Ask a lactation professional how often for this family.
• Avoid shame. Guilt was higher among supplementing mothers in the survey. A doula can reduce it by naming what the parent is doing well.

Putting the evidence into practice

1. Start with the parent’s goal. “What would feel like a good feeding plan for you?”
2. Offer information, not directives. Share the AAP’s recommendation and the mixed research honestly if the parent asks.
3. Teach safe formula preparation and responsive feeding. See Formula Feeding: What Doulas Should Know About Safe Preparation and Responsive Feeding.
4. Connect to lactation support. Whether the goal is to keep breastfeeding, to pump or to wean gradually, a lactation professional can tailor the plan, and an ABM-aligned clinician can advise on medical supplementation.
5. Refer for baby concerns. Weight loss, dehydration signs, jaundice or feeding refusal need the baby’s provider. See Newborn Weight Loss and Weight Gain: What’s Typical and When Is Evaluation Needed?.

Limits and uncertainty

The two trials differ in design and population and were small relative to the question; the 2013 trial enrolled only 40 infants. The cohort and survey data are observational and self-reported, with samples that were mostly white and highly educated in the Irish cohort and self-selected in the survey. No high-quality evidence was found on how different volumes, timing or methods of combination feeding affect long-term infant health, and the terms “mixed,” “combination” and “supplementation” are used differently across studies. The ABM protocol dates from 2017. This article draws on the AAP page and relevant ABM sections in full text and the research articles as abstracts. Families with medical indications for supplementation should follow their clinician’s plan.

The bottom line

Combination feeding is common, and the research does not show that mixing breast milk and formula is simply good or bad for breastfeeding. Trials conflict, cohort associations are confounded, and the emotional cost of feeling judged is documented. A doula serves families best by giving accurate information, respecting the plan they choose, protecting milk removal where they want to continue breast milk, and sending medical and lactation questions to the right professional.

Birth & Baby University’s For Doulas page outlines its postpartum doula training, recertification and mentorship for doulas who support families through feeding decisions. Confirm that any program meets your certifier’s, employer’s or state’s requirements before you enroll.

This article is for professional education. It is not medical, legal or tax advice. Check the standards of your certifying organization and the rules where you work. For concerns about a baby’s health, contact a pediatric provider or emergency services.

Sources and further reading

• American Academy of Pediatrics. Why We Support Breastfeeding for Your Baby’s Health (HealthyChildren.org). Read the source (read October 2026)
• Kellams A, et al. ABM Clinical Protocol #3: Supplementary Feedings in the Healthy Term Breastfed Neonate, Revised 2017. Breastfeeding Medicine (2017). Read the source
• Academy of Breastfeeding Medicine. Recommendation for Exclusive Breastfeeding: Avoidance of Underfeeding and Overfeeding (position statement, October 2024). Read the source
• Flaherman VJ, et al. Effect of early limited formula on duration and exclusivity of breastfeeding in at-risk infants: an RCT. Pediatrics (2013). Read the source
• Flaherman VJ, et al. Effect of early limited formula on breastfeeding duration in the first year of life: a randomized clinical trial. JAMA Pediatrics (2019). Read the source
• Hemmingway A, et al. A detailed exploration of early infant milk feeding in a prospective birth cohort study in Ireland: combination feeding of breast milk and infant formula and early breast-feeding cessation. British Journal of Nutrition (2020). Read the source
• Komninou S, et al. Differences in the emotional and practical experiences of exclusively breastfeeding and combination feeding mothers. Maternal & Child Nutrition (2017). Read the source

More for professionals: the Professionals Blog.