How Does the Digestive Tract Work?

How Does Your Child's Digestive Tract Work?

Digestion begins in the mouth. When your child chews, the teeth break food into smaller pieces while saliva begins the chemical process of breaking down carbohydrates — long before the food is swallowed.

Once swallowed, food travels down the oesophagus to the stomach, where gastric acid breaks it down further into a semi-liquid form. From there, it moves into the small intestine — the primary site of nutrient absorption, where proteins, fats, vitamins, and minerals pass through the intestinal wall into the bloodstream.

Whatever the small intestine cannot absorb moves into the large intestine, where water is extracted and the remaining waste is formed and eventually excreted.

Key Organs That Support Digestion

The digestive tract does not work alone. Several supporting organs produce the enzymes and chemicals that make digestion possible:

• The salivary glands produce enzymes in saliva that begin breaking down carbohydrates in the mouth.
• The liver produces bile, which is stored in the gallbladder and released into the small intestine to help break down dietary fats.
• The pancreas produces digestive enzymes that break down proteins, fats, and carbohydrates, as well as hormones such as insulin that regulate blood sugar.

Beyond these organs, the gut microbiome — the vast community of bacteria living in your child's intestines — plays a critical role in digestion, nutrient absorption, and immune function. A healthy, diverse microbiome supports the whole system. An imbalanced one can undermine it.

The Gut-Brain Connection

Research into the gut-brain axis — the communication network between the digestive system and the brain — has grown significantly in recent years. Studies suggest that the health of a child's gut microbiome can influence not just digestion, but also mood regulation, stress responses, and aspects of cognitive development.

Dysbiosis, or an imbalance of gut bacteria, has been associated in research with increased gut inflammation, difficulty absorbing key nutrients, and gastrointestinal conditions such as irritable bowel syndrome. While this is an evolving area of science, it reinforces how central gut health is to a child's overall wellbeing — not just their digestion.

Signs Your Child's Gut May Not Be Functioning Well

The digestive system rarely fails all at once — signs of disruption tend to appear gradually. Watch for the following:

• Recurring constipation or diarrhoea that does not resolve within a few days
• Frequent bloating, stomach discomfort, or complaints of tummy pain
• Unexplained fatigue or low energy despite eating regularly
• Slow growth or weight gain that does not track with expected milestones
• Frequent infections or a weakened immune response — since around 70% of the immune system is housed in the gut, poor gut function can reduce immune resilience

It is worth noting that these signs can have multiple causes. If they are persistent or accompanied by other symptoms, consult your paediatrician rather than managing them with dietary changes alone.

How Nutrition Supports a Healthy Gut

What your child eats directly shapes the health of their digestive system. A varied, fibre-rich diet is the single most important dietary factor in supporting a well-functioning gut.

Fruits, vegetables, and wholegrains provide dietary fibre that feeds beneficial gut bacteria and supports regular bowel movements. Adequate hydration matters equally — water keeps food moving through the digestive tract and supports the body's natural elimination process. A child who eats well but drinks too little will often struggle with constipation.

Key Nutrients for Gut Health in Children

Beyond fibre, several specific nutrients play a direct role in gut function:

• Prebiotic fibre from foods such as oats, bananas, carrots, and legumes feeds the growth of beneficial gut bacteria, helping maintain a balanced microbiome.
• Iron supports the gut lining and is essential for digestive enzyme production — deficiency is common in young children and can quietly disrupt digestion and energy levels.
• Zinc plays a role in maintaining the integrity of the intestinal wall and supporting immune function within the gut.
• B vitamins are involved in energy metabolism and the proper functioning of the digestive system — deficiencies can contribute to fatigue and poor appetite.

Probiotics and Your Child's Digestive Health

Probiotics are live beneficial bacteria that, when consumed in adequate amounts, support a balanced gut microbiome. In children, they have been studied for their role in reducing the duration of diarrhoea, supporting gut barrier function, and relieving constipation.

Not all probiotic strains do the same thing — strain specificity matters. L. reuteri is one of the better-researched strains in young children, with clinical evidence supporting its role in reducing constipation and improving tummy comfort in children aged 1 to 3.

For parents looking to incorporate probiotic support into their child's daily diet, LACTOGROW Aktif is scientifically formulated with L. reuteri probiotics alongside an optimum combination of 15 vitamins and minerals carefully crafted to meet the nutritional needs of children aged 1 to 3. It contains 0% added sucrose, making it a considered choice for parents who want comprehensive digestive and nutritional support backed by science in a single daily serving.

Probiotics from food sources — such as plain yogurt — are also a good addition to your child's diet where tolerated. Speak to your paediatrician if your child has persistent digestive issues before starting any supplement.