Not all solids are created equal: from chemistry to weaning
In short: The term 'solids' covers vast ground, from the rigid crystalline structures of chemistry to the developmental milestone of a baby's first meal. Understanding these two worlds requires looking at how internal bonds and physical development dictate the way matter—and humans—interact with the world.
In the realm of chemistry, the properties of a solid are dictated by its internal arrangement and the nature of its chemical bonds. Scientists distinguish between amorphous solids and crystalline solids. Crystalline solids possess a highly organized structure, while amorphous solids lack this long-range order. Within the crystalline category, substances are further classified by their atomic structures, which ultimately determine the material's unique physical characteristics. These specific atomic arrangements directly influence how a material behaves. Consequently, the specific bonding types present are what define each substance's unique properties.
In a biological context, 'doing solids' refers to the process of weaning, or complementary feeding. This transition typically begins around 6 months of age, once a child has developed the necessary physical maturity. At this stage, the goal is not just nutrition—as breast milk or infant formula remains the primary energy source—but rather introducing the concept of eating and helping the child master new textures. This period allows infants to gradually expand their diet to include family meals. Eventually, the child can consume the same variety of foods as adults, albeit in smaller quantities.
Physical readiness is crucial for a successful transition to solid foods. A child demonstrates readiness when they can sit steadily, hold their head up, and coordinate their eyes, hands, and mouth to manage food. They must also be able to swallow food rather than spitting it out. While parents might mistake behaviors like chewing fists or waking more frequently at night as signs of hunger, these are often just normal developmental stages rather than indicators that a baby is ready for solids. It is also important to consult a GP or health visitor if your infant was born prematurely. They can provide tailored guidance on the best timing for starting this new feeding stage.
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Sources
- Summary by Intellect · source: Doing Solids: Crash Course Chemistry #33
- Also: Your baby's first solid foods
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