It is tempting to think of a child's dose as a fraction of an adult's, worked out by weight. Weight is part of it. It is not the whole of it, and the difference is why paediatric formulations are developed separately rather than divided down.

The Body Handles It Differently

Absorption, distribution and clearance all change with age, and they do not change together or at the same rate. An infant clears some drugs more slowly than an adult and others faster. Scaling by weight alone assumes a relationship that is simply not there.

The Form Has to Suit the Patient

A tablet a four-year-old cannot swallow is a dose they do not receive. That is why the paediatric range runs to suspensions, drops and dry syrups: forms that can be measured in small increments and taken without difficulty.

It is also why flavour is a formulation decision rather than a marketing one. A medicine refused is a medicine that does not work.

Measuring Is Part of the Product

Every paediatric liquid should ship with the device it is meant to be measured with. A kitchen spoon varies by a factor of two between drawers, and at paediatric volumes that is the difference between a dose and a mistake.

Conclusion

A paediatric formulation is a different product built for a different patient — in strength, in form, in flavour and in how it is measured. Treating it as a scaled-down adult one gets all four wrong.