English Translation
My grandson is still a baby.
‘Barnbarn’ is ‘grandchild’, and it doesn’t say anything about gender.
My grandson is still a baby.
‘Barnbarn’ is ‘grandchild’, and it doesn’t say anything about gender.
The alternative is to use one of the specific combinations: sonson, sondotter, dotterson, or dotterdotter.
BTW, bebis sounds like child-speak; the standard word is spädbarn, but you can also say baby.