Originally Posted by
rsteinmetz70112
On a full flight they may try to seat someone there. This evening I was on an almost full flight and there was a family with multiple small children and the FAs spent a good deal of time getting someone to move to get the children with a parent
If you have a confirmed seat for an infant, the FAs will not try to seat someone there. This is why the OP needs to just politely tell the FA that their infant has a confirmed seat.