Reducing child mortality was one of the goals of

Reducing child mortality was the fourth of the Millennium Development Goals running from 2000 to 2015.

The Sustainable Development Goals cover child health within a wider health goal but did not carry this as a standalone target.

Because it was a distinct millennium goal, it was not held by both frameworks together.

It clearly belonged to one framework, so neither-of-them is wrong.

The dedicated child mortality target belonged to the millennium framework.

The successor goals aim to end preventable child deaths by 2030.