If you’ve ever watched a toddler eat butter straight from the dish, gnaw on a bone, or instinctively reach for an egg yolk over a dry cracker, you’ve seen ancestral wisdom at work. Children know, deep in their biology, what nourishes them, long before modern food systems interfered with brightly coloured snack packs and fortified cereals.

For thousands of years, humans raised strong, healthy children without multivitamins, protein powders, or the latest "kid-friendly" processed foods. In fact, in most cultures, "kid's food" didn’t exist, children ate the same nourishing meals as adults.

So let’s break it down, from preconception through the teenage years: what’s happening at each stage, what nutrients matter most, and how we can practically support lifelong resilience at the table and beyond.

1. Preconception & pregnancy (laying the foundations)

Key developments

Not everyone gets the luxury of planning their nutrition months before pregnancy. But whether you're preparing in advance or already expecting, the foods you eat before conception and the nine months of pregnancy shape a child’s future health in profound ways. Maternal nutrition directly influences foetal brain development, organ formation, and even lifelong metabolism. During pregnancy, the baby’s brain, bones, immune system, and gut microbiome all develop rapidly, drawing from the mother’s nutrient stores. The placenta acts as a nutrient gatekeeper, prioritising essential vitamins and minerals for foetal growth, but when maternal stores are insufficient, the baby may receive suboptimal levels of key nutrients.

For example, inadequate choline intake can downregulate genes responsible for hippocampal neurogenesis, impacting memory and cognitive function.

How to support them

• Nose to tail nutrition: Nutrient-dense organ meats like liver, heart, and bone marrow provide bioavailable vitamin A (crucial for embryonic development), heme iron (preventing gestational anemia), and glycine (needed for collagen synthesis and proper foetal growth). Glycine is especially critical, as pregnant women cannot endogenously synthesise enough to meet demand.
• Support gut health: Your gut health directly influences your baby’s developing immune system. Fermented foods like sauerkraut, kefir, and raw dairy provide probiotics that help build a diverse microbiome, reducing inflammation and supporting digestion.
• Prioritise DHA & choline: DHA (docosahexaenoic acid), a structural fat in the foetal brain and retina, is preferentially transported across the placenta, depleting maternal stores if dietary intake is low.  Choline, found in egg yolks and liver, acts as a methyl donor, regulating DNA methylation processes that influence neurodevelopment and stress resilience.
• Balance minerals: Calcium, magnesium, and phosphorus (from raw dairy, shellfish, and bone broth) are required for foetal skeletal development. Magnesium also modulates vascular tone, reducing the risk of gestational hypertension and preeclampsia.
• Sync with circadian rhythms: Exposure to natural light regulates maternal melatonin production, which crosses the placenta and helps synchronise the foetal circadian system. Melatonin also exhibits antioxidant properties, protecting the developing brain from oxidative stress.

2. Infancy (0–1 year): Brain and immune development

Key developments

The first year of life is a metabolic inferno. The human brain triples in size between birth and age three, requiring an intense supply of cholesterol, saturated fat, and DHA. Breast milk, the ultimate ancestral food, provides these in perfect proportions. More than just nourishment, it’s a living substance packed with immunoglobulins, white blood cells, and prebiotics that shape the infant’s gut microbiome. The first milk, colostrum, is so nutrient-dense that it’s often called "liquid gold", an immune-boosting elixir modern medicine can’t replicate.

Yet the modern world, in its infinite wisdom, often replaces this perfect food with ultra-processed formulas, many based on soy and vegetable oils. 

Around six months, the conversation shifts to solid foods, and here, the ancestral versus modern divide is stark. Today’s paediatricians often advise iron-fortified rice cereal as a baby’s first food, a nutritionally barren, ultra-processed starch. Compare this to traditional societies, where babies were introduced to liver, egg yolks, bone broth, and fermented foods. Liver puree, once a common weaning food, provides bioavailable iron, zinc, and vitamin A, supporting brain development far better than fortified cereals. Egg yolks, rich in choline and DHA, mirror the composition of breast milk, making them a logical next step in feeding. Bone broth, teeming with collagen and glycine, soothes the gut and builds connective tissue.

The immune system is also maturing, with gut colonisation playing a major role. A newborn’s gut is initially sterile but is quickly populated by microbes from breast milk, skin contact, and the surrounding environment. These early microbial exposures shape immune tolerance and determine susceptibility to allergies, autoimmune conditions, and infections later in life.

How to support them

• Breast feed if possible
• Introduce nutrient-dense first foods:  Instead of rice cereal, offer liver puree for bioavailable iron, zinc, and vitamin A. Egg yolks provide choline and DHA, crucial for brain development.
  
• Offer soft fruits in their whole form: Mashed banana, avocado, and stewed apples provide vitamins, minerals, and natural enzymes that aid digestion. Well-cooked carrots or sweet potatoes, mashed with butter or coconut oil, enhance carotene absorption and mimic the high-fat nature of breast milk, ensuring a steady supply of essential fatty acids.

3. Toddlerhood (1–3 years): Supporting Rapid Brain Growth and Gut Maturation

Key developments

By toddlerhood, the brain is still devouring nutrients at a relentless pace. Cholesterol, saturated fat, and DHA remain indispensable, human breast milk is over 50% fat for a reason. Yet this is precisely the age when modern parents are pressured to switch to low-fat dairy, fear cholesterol, and fill their child’s plate with processed toddler snacks instead of real food.

The idea that children need low-fat milk is a modern invention, in reality, restricting fat intake at this stage can hinder cognitive development. The same goes for cholesterol. Every neuron in the toddler’s brain is wrapped in a cholesterol-rich myelin sheath, and without enough dietary cholesterol, the process is suboptimal.

Yet another battleground emerges in these years: the rise of the picky eater. It’s no coincidence that modern children, raised on hyper-palatable processed foods, develop preferences for sweet and bland over nutrient-dense and savoury. 

Toddlerhood is the period where metabolic programming happens. The child’s preferences, microbiome, and neurological wiring are still malleable. If you feed them processed grains, refined sugars, and vegetable oils, and you reinforce cravings for modern junk food. 

How to support them

• Keep fat intake high: Full-fat dairy, egg yolks, and animal fats support brain myelination and cognitive function.
• Offer a variety of textures and flavours: Exposure to nutrient-dense foods early on helps prevent picky eating. Instead of bland toddler snacks, introduce savoury, umami-rich options like slow-cooked meats, bone marrow, and fermented vegetables.
• Focus on metabolic health:  Blood sugar regulation is still developing, and refined carbohydrates can cause behavioural swings. Replace sugary cereals and processed snacks with whole food alternatives like cheese, meat, and fruits
• Encourage outdoor movement: Natural play, climbing, running, and balancing, supports brain and nervous system development in ways structured indoor activities cannot.
• Introduce collagen-rich foods:  Toddlers are growing rapidly, and their bones, joints, and connective tissues require glycine, proline, and hydroxyproline from collagen. Bone broth, slow-cooked meats with skin and connective tissue, and homemade gelatine snacks provide these structural amino acids.
• Avoid ultra-processed baby snacks: Their hyper-palatable nature disrupts natural hunger signals and can lead to a preference for bland, nutrient-poor foods.

4. Early Childhood (4–7 years): Fuelling growth and learning

Key developments

During early childhood, kids develop executive function, problem-solving skills, and emotional regulation. Their bones are rapidly mineralising, requiring sufficient calcium, magnesium, and vitamin K2. The immune system also undergoes major refinement: exposures to new environments, school settings, and outdoor play help train a resilient immune response.

How to support them

• Support mineral absorption with vitamin K2:  This nutrient directs calcium into bones and teeth rather than soft tissues. It’s found in grass-fed dairy and egg yolks. Pairing vitamin K2 with vitamin D (from sunlight) optimises bone mineralisation.
• Balance blood sugar for stable energy: Blood sugar fluctuations can impact focus and emotional regulation. Prioritise protein and healthy fats at breakfast to provide sustained energy for learning and play. Avoid high glycemic breakfasts like toast and cereal, which can cause mid morning crashes.
• Reduce processed foods & industrial seed oils: The high omega-6 content in processed snacks contributes to inflammation, insulin resistance, and metabolic dysfunction. Cooking with traditional fats like butter, ghee, and coconut oil supports optimal brain and immune health.
• Maintain circadian rhythm: Sleep is crucial for brain consolidation and immune function. Blue light exposure from screens in the evening can delay melatonin production, leading to poor sleep quality. Dim lighting, early bedtimes, and exposure to natural morning light help regulate the child's sleep-wake cycle.