I feed Rylie Natural Balance Limited Ingredient Diet Potato & Duck Formula Small Breed Bites. She does really well on it (I also feed the same brand to my cat). It is grain free and high quality ingredients and the protein is lower than BB. Check out their website!
Dick Van Patten's Natural Balance L.I.D. Limited Ingredient Diets Potato & Duck Formula
If you go to Contact Us in the upper right hand corner and e-mail asking for free samples they will gladly mail some to you! You can see if your baby likes it without spending any money. I hope this helps!