Перевод - Португальский (Бразилия)-Английский - Manejos na dor da criança

Não é que esteja errada. Me parece um tanto inadequada. Melhor seria "lidando com a dor infantil".

Concordo com você pfcosta, mas literalmente...

What does it mean literally? Maybe we can put that in the remarks area.

Lembrando: O texto a ser avaliado é o em inglês e não o em português...
It's very good for me.

I've never seen this word (manejo) in this context.
We use this word for "things", not "persons".
Maybe an automatic translation into portuguese.

The word "manejo" is not very common, but it exists and means "dealing" "handling". It comes from "manejar" that may look like Spanish (drive) but I can asure you that is Portuguese. And the word refers to "pain" that is not a person.

I think that even the word manejo is used to objects, the english form is correct.

I've never seen this word (manejo) in this context.
The word "manejo" (mão) has the same origin of the matching english "handling", wich means "use one's hands".
Manejar armas; remanejamento.
But "manejar a dor", I think that it's a little strange.
The english is correct somehow.

Should it be "a child's pain" or "children's pain"?

We do have an expression in English: "to manage pain" - I wonder if this is a back-translation.

Right. I said that "manejo" and "handling" have the same (physical) origin.
Now: "manejo" and "management" share the same root, latin "manus".
And the actual translation of "management" in portuguese is "gerenciamento", almost a synonym for "manejamento", but that one applies to persons.
There is a "gerenciamento da dor".