Its a Lavender Orpington. This chick is single combed. And its normal for dark colored Orpingtons "like black, blue, and lavender" to have a dark was over their white legs. You can see the white in the toes and most likely the bottom of the feet. Orpingtons are a slower developing breed, so that's why the comb has changed much as far as growth. On the other end of the spectrum Leghorns are a fast developing breed and show significant comb growth after the first few weeks.