Another option is to loop from 0 to the value of the row's ChildRowsCount property, and use getChildRow() at each index.  This is a more useful approach than using getChildRows() if you intend on performing some action on each row.

for (var i = 0; i < row.ChildRowsCount; i++)
{
    var childRow = row.getChildRow(i);
}

By the way, if you plan on deleting any of these rows, I suggest looping through the list backwards instead, so you don't miss anything:

for (var i = row.ChildRowsCount - 1 ; i >= 0; i--)
{
    var childRow = row.getChildRow(i);
}

Is there another way to get list of child rows without using row.getchildrows().

 Thanks