Making baby food at home is wonderful — you control the ingredients, the texture, the variety, and it’s far cheaper than jars. But babies aren’t small adults. Their immune systems are immature, their gut flora is developing, their kidneys handle substances differently, and the margin for error is smaller. The food safety rules for baby food are the regular rules, tightened.

Here’s what changes when the consumer is six months old.

Why babies are higher-risk. An infant’s immune system is still learning — it hasn’t built the defenses adults have. Their stomach acid is less acidic (higher pH), which means fewer bacteria are killed on the way down. Their gut microbiome is immature, offering less competitive protection against pathogens. And they’re small — a dose of toxin or pathogen that’s trivial for an adult can overwhelm an infant. This is why every food safety authority treats infant food with extra caution, and why you should too.

Cooking: thorough, always. Every ingredient in homemade baby food should be fully cooked — meats to safe temperatures (74°C/165°F for poultry, 63°C/155°F for ground meats with rest… but for babies, just cook everything thoroughly — no medium-rare anything), vegetables until soft, fruits cooked unless they’re being served fresh and washable (banana, avocado). There’s no “lightly steamed” or “al dente” in baby food. Cook it through.

The nitrate question. This one surprises parents: certain vegetables are naturally high in nitrates — spinach, beets, carrots, green beans, squash. In infants under 3–6 months, high nitrate intake can cause methemoglobinemia (“blue baby syndrome”) — nitrates convert to nitrites in the infant gut, which interfere with oxygen transport in the blood. The guidance: avoid homemade high-nitrate vegetable purees for very young infants (under 3 months — though most babies aren’t eating solids that early anyway), and don’t use the cooking water from these vegetables (nitrates concentrate in it). Commercial baby foods are tested for nitrate levels; homemade isn’t — so for young infants, favor lower-nitrate vegetables (peas, sweet potato) or wait until the baby is older. By 6+ months, the risk drops substantially — but it’s worth knowing.

Honey: the hard no. Never give honey to infants under 12 months — not in food, not on a pacifier, not “just a taste.” Honey can contain Clostridium botulinum spores, which are harmless to older children and adults (mature gut flora outcompetes them) but can germinate in an infant’s immature gut, producing botulinum toxin inside the baby. Infant botulism is a medical emergency — floppy baby, weak cry, difficulty feeding. It’s rare, but it’s devastating, and it’s completely preventable. No honey before one. This includes baked goods with honey (the spores survive baking — they’re heat-resistant). The first birthday is the milestone.

Cooling and storage: faster and shorter. Baby food follows the same cooling rules (cool quickly, refrigerate promptly) but with tighter storage limits:

• Refrigerated: use within 1–2 days (not the 3–4 days for adult leftovers). Babies’ lower defenses mean less margin.
• Frozen: excellent for baby food — freeze in ice cube trays or small portions, transfer to labeled bags, use within 1–3 months. Thaw in the fridge, not on the counter.
• The serving bowl rule: serve the baby’s portion in a separate bowl. Don’t feed directly from the storage container — the spoon goes from baby’s mouth (bacteria) back into the food. Whatever’s in the serving bowl gets discarded after the meal — no saving half-eaten portions. Baby saliva in the food is a bacterial inoculation; the clock starts immediately.

Reheating: thorough and tested. Reheat to steaming throughout (74°C/165°F), stir well to eliminate hot spots (microwaves create them — and a hot spot can burn a baby’s mouth), and always test the temperature before serving — on your wrist or with a clean spoon taste. Babies can’t tell you it’s too hot until it’s too late. Stir, test, then serve.

Hygiene: the full protocol. Everything that touches baby food should be scrupulously clean: hands washed before prep, equipment sanitized (bottles, blender parts, storage containers), produce washed thoroughly, surfaces clean. For newborns and young infants, sterilizing bottles and equipment (boiling or steam sterilizer) is standard — follow your pediatrician’s guidance on when to transition to regular thorough washing.

Water for formula and food. If using well water or any non-municipal source, have it tested — nitrates in well water are a real concern for infant formula preparation (same methemoglobinemia mechanism as the vegetable nitrates). Municipal tap water is generally fine, but if your area has nitrate issues or lead concerns, use appropriate filtration or bottled water. When in doubt, ask your pediatrician.

Introducing allergens: the modern guidance. The old advice (delay allergens) has been replaced: current guidance from pediatric authorities favors early introduction of common allergens (peanut, egg) — around 4–6 months, in age-appropriate forms — as it may reduce allergy risk. This is a conversation for your pediatrician (especially with family history of allergies), not a DIY decision — but don’t avoid allergens out of fear. The science moved; make sure your approach did too.

What NOT to make at home (or to handle carefully):

• Unpasteurized anything — no raw milk, no unpasteurized juice. Pasteurization exists for exactly this vulnerable population.
• Home-canned low-acid foods for babies — the botulism risk calculus is unforgiving at this age. Commercial baby food or fresh preparation instead.
• Rice-heavy diets — rice can contain inorganic arsenic (absorbed from soil/water). The FDA advises varying grains for infants rather than relying solely on rice cereal. Oat, barley, and multigrain cereals diversify the exposure.

Cook thoroughly, cool fast, store short, reheat completely — the ordinary rules, applied with infant-grade rigor. A six-month-old is the most vulnerable consumer in any kitchen, and the extra caution isn’t paranoia; it’s proportionate.

And when in doubt? The pediatrician outranks the blog post — including this one. Ask them.