The exact causes remain unclear. There is no single explanation, but rather several hypotheses which, combined, may contribute to some babies going through this phase more difficult than others.
During feeds, whether at the breast or from a bottle, babies sometimes swallow air. This build-up can increase intestinal discomfort and cause painful wind. Understanding the cause can help find ways to soothe your baby's colic.
Main hypotheses
The most frequently cited explanation is the immaturity of the digestive system. During the first few weeks of life, a baby's digestive organs are still learning: they are discovering digestion, bowel transit, the regulation of wind… All of this can cause tension, discomfort and even pain.
Another important factor is the gut microbiome — in other words, the digestive flora. At birth, it is still not very diverse and takes several weeks to develop. This temporary imbalance can encourage the formation of air bubbles, bloating or increased sensitivity.
Sometimes, babies swallow air whilst feeding or crying, which further increases their intestinal discomfort. This is very common, especially if feeding happens in a rush or if the baby has a strong sucking reflex. The build-up of air can then make the pain worse.
Finally, the impact of the environment should not be underestimated: some babies are particularly sensitive to visual, auditory or emotional stimulation. A day full of new experiences, an irregular routine or excessive tiredness can be enough to trigger an episode at the end of the day.
In some cases, tummy aches also seem to be linked to food: either to the composition of infant formula, or indirectly to what the mother consumes if she is breastfeeding. But again, there is no strict rule: what upsets one baby will have no effect on another.
Colic and breastfeeding: is there a link?
Breast milk is not to blame — quite the contrary: it is perfectly suited to your baby's needs. However, some mothers notice an improvement in symptoms when they make slight changes to what they eat, particularly by temporarily reducing dairy products, stimulants (coffee, tea, chocolate), or certain fermentable vegetables. It may also be due to a compound present in a breastfeeding supplement taken by the mother.
These adjustments are not necessary for everyone, and should always be made gently, without stress or excessive restriction. However, they may be worth exploring if digestive hypersensitivity is suspected.
A growing number of studies are also looking at the role of the maternal microbiome, which directly influences the baby's microbiome through birth and then breastfeeding. Taking care of your gut flora in the post-partum period (through diet or via a post partum supplement rich in probiotics) could therefore, indirectly, support the gut balance of the infant.