Cute. I haven't seen Dexter's Lab in a long time but I say, you do a good job on making a 5 year old version of her.
I've always wondered what an infant version of her looked like. I don't think I've seen that on the episodes I saw.
I think I might have to redraw Dee Dee in a cartoon where Dexter is not toilet trained when he is 4 (I got the idea from early in the 'Elf' movie). If Dee Dee is 5, Dexter would be 3, if this is correct.