"Το παιδί είχε σταματήσει για λίγο."

Translation: The child had stopped for a while.

[cparticle]

The child had stopped for a little or for a little bit should be accepted.

[jaye16]

Of course and they are included in the drop down just got left off the sentences. I'll edit it now. Thank you.

[Daniel569569]

The child had stopped for moment seems reasonable

[troll1995]

For a moment=για μια στιγμή. It has a similar meaning, but it is not the same.

[Merven7]

Can λίγο not simply mean "a while"?

[jaye16]

Yes, it's also one of the accepted translations.