The surprising link between baby sleep and gut health - By Dr Megan Rossi (PhD, RD)
Dr Megan Rossi (PhD, RD) is the founder of The Gut Health Doctor, SMART STRAINS, The Gut Health Clinic, and Bio&Me.
The surprising link between baby sleep and gut health
When you're navigating life with a newborn, sleep can feel completely out of reach, something I know very well as a mum of three. While soothing routines and good sleep habits absolutely matter, there's also growing scientific evidence that your baby's gut health may play a role in sleep patterns and overall comfort.
1. Did you know your baby's gut has a sleep–wake rhythm too?
Your baby's gut isn't just quietly digesting milk; it has its own internal clock. Even in the first year of life, gut microbes follow daily patterns, with different types of bacteria becoming more or less active at certain times of day.
Research suggests these microbial rhythms begin to sync with your baby's sleep–wake cycle. As your baby's gut develops, it may gently support when they feel sleepy or more alert.
It's not a magic fix (I wish it were), but a healthy, balanced microbiome could be one of many factors that help support more settled sleep over time.
2. How gut health may help with colic and crying spells
Colic is exhausting — for babies and parents alike. Affecting up to a quarter of babies, it can take a real emotional toll on families.
Research shows that babies with colic often have reduced gut microbial diversity and lower levels of Bifidobacteria, a group of beneficial, anti-inflammatory gut bacteria.
Clinical trials have found that supplementing colicky babies with a specific live strain (BB-12) was associated with reduced crying and improved sleep, alongside better quality of life for caregivers.
If your baby's symptoms continue, or you're finding things emotionally tough, please reach out to your GP or health visitor. You know your baby best — and support matters.
3. What you eat in late pregnancy may shape your baby's gut
Your baby's microbiome begins developing even before birth, and what you eat during pregnancy can influence it. Not that we need any more pressure on ourselves, but understanding this can make life easier, when it comes to weaning for example.
Research shows that a mum's diet in the third trimester can influence not only the types of gut bacteria a baby carries in the first few months of life, but also their early acceptance of different tastes.
A diverse, plant-rich maternal diet therefore, can help seed a more resilient early microbiome and make babies more open to plant-based foods later on, which can support digestive comfort and even sleep behaviour.
Of course, this isn't always easy. When you're exhausted, your cravings are intense, or there's simply no time to think about meals, gut health can feel like the last priority. If you're struggling with nausea it can feel even harder. If this sounds familiar, these tips may help:
Eating little and often (6–8 small meals a day could help). Choosing complex carbs with protein (like sourdough and eggs). Trying ginger, a natural anti-nausea remedy (check with your midwife first). Opting for cold foods, which tend to smell less. Making the most of good days to prep fibre-rich snacks.
Don't stress about "perfect" meals. Add in gut-friendly foods where you can - even blending spinach into a smoothie or stirred into pasta sauce counts.
4. C-section or vaginal birth? You can still support your baby's gut
Babies born vaginally pick up beneficial bacteria from the birth canal. C-section babies get a different mix, often more from the skin or hospital environment.
This doesn't mean anything's wrong - your birth story is your own, and what matters most is safety.
After birth, things like skin-to-skin contact, time outdoors, and the right probiotic strains (like LGG during or after antibiotics) can all help build up your baby's microbial diversity, regardless of delivery method.
If you need antibiotics during pregnancy, delivery or afterwards (which happens for around 40% of women and is typically routine for C-sections) it's important to protect your gut. I always recommend taking 10 billion LGG probiotic strain twice per day during antibiotic treatment and for seven days afterwards. This advice is backed by the World Gastroenterology Organisation and helps reduce unwanted side effects by 70% compared to placebo in clinical trials.
LGG is safe during pregnancy and breastfeeding and helps support a healthy gut microbiome at a time when it's easily disrupted. This is the exact formulation found in SMART STRAINS for when you're on antibiotics, and why it went straight into my hospital bag too.
5. Breastmilk helps build gut health — but it's not the only way
Breastfeeding supports gut diversity. Studies link it with increased microbial diversity, including a boost to levels of Bifidobacteria, the same group associated with reduced colic.
But if you're bottle feeding, many formulas now include helpful extras like probiotics and prebiotics such as HMOs to nourish your baby's gut too, playing an important role.
"Every feeding journey is unique. What matters is that your baby is fed, loved, and thriving — and both breastmilk and formula can support gut development."
6. It's not just food — the outdoors helps too
Food isn't the only thing shaping the microbiome; our environment matters too. If you can, spending time outdoors can be incredibly beneficial.
Time outdoors supports wellbeing for both parents and babies. Fresh air, natural light and gentle movement can all play a role. Stress reduction, immune regulation and metabolic benefits, not to mention exposure to the millions of microbes floating in fresh forest air, and it may even support your baby's gut health too.
This is where your SnoozeShade becomes wonderfully practical — helping babies nap comfortably and safely while you enjoy time outside together, soaking up the benefits of being outdoors.
This article is for general information only and does not replace personalised medical advice. Always speak to a healthcare professional if you have concerns about your baby or your own wellbeing.
