Why Babies Put Everything in Their Mouths (And Why You Don’t)

Olfaction (Micro Risk (Mid Distance)): As we move it nearer, little molecules begin to rise into our nasal cavity — it is the kind of issue that is called volatile organic compounds. The Psychology of Distance & DangerThere’s a very real, hierarchical reason for that list order — it’s all based on the relative threat:Vision = No Risk (far out) Your eyes can take in the scene from afar, assess potential threats without having to actually engage them. Your brain is sorting through your visual database for patterns: Is it moving?

Is it slim?

Is it covered in bright, warning colours (aposematism), like a neon red or yellow?

If it passes the visual sniff test, you allow it closer.

Olfaction = Micro Risk (Mid Distance): As you bring it closer, molecules begin to float into your nostrils — what are called volatile organic compounds. Our sense of smell is, in effect, an organic chemical detector; unpleasant compounds, associated with decomposition or poisoning (like sulfur), will cause an almost instantaneous urge to recoil, long before it touches our lips.

Touch = Physical Safety Check (Contact): Before tasting anything, you usually touch it. Your lips and fingers are equipped with countless touch sensors that analyse texture. Are you sticking your finger into a unnaturally sticky, slimy, uncomfortably hot, or sharp substance? In nature, sliminess can signify a bacterial biofilm, which signals danger.

Gustation = Micro-Dose Analysis (Internal): If it has passed the first three filters, you take a tiny sip. You wouldn’t normally stuff your face full of a totally unknown substance; instead, you’d tentatively sample it, to see if the inner systems detect anything overtly poisonous.

2. The Omnivore’s DilemmaNot all animals follow this specific testing routine. Specialised eaters, like pandas, whose diet consists primarily of bamboo, know exactly what’s safe — it’s in their genes. We, however, are omnivores. When our earliest ancestors emerged into new terrains, faced with countless unfamiliar plants and creatures, this layered testing regime was our built-in behavioral programme, which kept the human species from succumbing to acute food poisoning.

3. The Tongue: a Biological Chemical Weapon ScannerThis tiny part of the body is actually a complex internal abort system:*25 Bitter receptors:Humans possess about 25 different taste receptor subtypes that recognise bitter substances, but just one type for sweet. Why? Many of nature’s most toxic alkaloids, plants, and toxins have a distinct, repulsive taste.

*The sour sensor: Acidity and harmful bacteria ferment into organic matter with a sharp taste that warns us to spit it out.

*The emergencygag reflex: If the tongue’s receptors register a highly concentrated dose of bitterness or sourness, a primitive brain response automatically kicks in — a gagging reflex, designed to eject it before a single droplet can be absorbed.

4. Why Babies Put Everything in Their mouths you want proof this is the a real story, watch babies. They’ll grab a new object, look at it, put it up to their nose and then pop it in their mouths. Although the infant’s eyes and motor controls are still being refined at this stage, the lips and tongue are rich with touch and chemical sensors. In the primal world, that’s how babies use their bodies to understand and map out their surroundings.

By Ahmed Nassar