I\'m using d3 to append some elements on enter() and then update them later. However, the next time i try to select those elements the selection is much larger than the orig
Like says Lars, there is no equivalent to 'children()' method in D3, but here left a little extension to d3.selection prototype i wrote. I hope must help you (so late).
d3.selection.prototype.children = function(d){
var that = this.node();
return this
.selectAll(d)
.filter(function(){ return that == this.parentNode; });
};