Raising multiples brings genuinely different practical challenges than singleton parenting content usually assumes, split attention, a higher chance of preterm birth, and often a mix of feeding approaches out of sheer logistics. If this describes your household, a combination of breastfeeding and formula out of practical necessity is completely reasonable, and it's genuinely better for everyone than holding yourself to an exclusive-breastfeeding standard built for one baby.
Twins share more gut bacteria than unrelated infants
A study following preterm twins and a set of triplets in intensive care found their gut bacteria were more similar to each other than to unrelated infants, likely reflecting shared genetics, the same exposure to their mother's gut bacteria at birth, and shared skin contact and feeding.
A large twin study on genetics versus environment
A study of over 1,100 twin pairs found that certain gut bacteria levels were partly shaped by shared genetics, not just shared environment and diet. This doesn't mean genetics decides everything, but it's a reminder that some similarities between your twins may be built in from the start rather than something you did differently between them.
The preterm reality a lot of families face
Multiples are a lot more likely to be born preterm than single babies, and preterm babies are less likely to have a vaginal birth or exclusive breast milk. If this is your experience, know that research on preterm gut development shows real resilience and ability to recover over time. This isn't a fixed disadvantage.
The practical reality of feeding multiples
Exclusively breastfeeding two or more babies at once is genuinely demanding, and a lot of parents of multiples use some mix of breastfeeding and formula out of practical necessity. A combination-fed approach is a completely reasonable, common path for families with multiples.
If you're expecting or raising multiples, build flexibility into your feeding plan from the start. If your kids were born preterm, focus on the same core basics as any parent once you're past the NICU stage, diet variety as solids begin, minimal unnecessary antibiotics, everyday exposure to the world. And give yourself real grace during the demanding early months. Your kids' gut health ultimately depends far more on years of consistent habits ahead than on getting every detail of the first weeks perfect.
This content is for educational purposes only and is not a substitute for professional medical advice.