Welcome to BYC! You have a beautiful chick. I saw your pictures on your other post. I believe your baby is a mix, and probably a female. Best of luck to you both!
To me your chick appears to be a female. Not sure of the breed but my fist guess would be Australorp. Need better pictures of her standing and profile. Birds are flock animals so some friends for her would be nice. You will find a lot of good information here Good luck with your chick and have fun...