I am not familiar with consultants in the Cupertino area, specifically, but can recommend a few resources for you. I have a newborn as well and have been trying to learn as much as I can about a good latch and overall good breastfeeding practices and success.
O'Connor Hospital offers a new mothers' support group which focuses on breastfeeding support. I have attended twice and find it helpful - group discussion as well as individual support/coaching. Mondays, 11:00am-12:30pm.
Here is a link w/info (scroll down toward bottom of page):
http://www.oconnorhospital.org/yourhealth/Pages/ClassesPr...
Good Samaritan Hospital offers a breastfeeding support group. I just learned about this from another mother, and she highly recommended the lactation consultant/nurse that facilitates the group. Tuesdays, 2-4pm. Here is a link w/info:
http://www.parentingandbreastfeeding.com/SupportGroup1.htm
Individual consultant: Janet Dombro (IBCLC)
###-###-#### or ____@____.com
Janet worked w/me in an individual consult at my home, and it was very helpful...and I may need to contact her again for a follow up.
Hope this helps. Would welcome knowing what resources you find to help you. Good luck!