I EBF and we just dropped down to 4 sessions per day and she eats solids 2-3 times a day. I feel like she can go a long time between nursing sessions, maybe even enough to drop a session. I don't really want her to just yet but am curious when this happened for others.
Trying for #2 since July 2010
BFP 8/1/10, missed m/c, D&C 9/15/10.
BFP 1/8/11, chemical pregnancy.
BFP 3/4/11, measured behind all along, no more HB 4/18/11. D&C 4/29/11. HCG didn't drop, Repeat D&C 6/17/11; confirmed molar pregnancy 6/23/11.
Forced break, including two Hysteroscopies in October to remove retained tissue.
BFP 12/29/11! Betas @ 10 dpo = 85, 14 dpo= 498, 22 dpo = 7242
Heard HB 1/24/12. 144 bpm!
Luca Rose born 9/9/12! More than worth the wait!

Re: When did your baby drop down to only 3 bottles/nursing sessions?
I think 6 months is WAY too early to drop to 3 (I'd say 4 is too few) - solids are just for practice at this point; her calories should mostly be from BM until much closer to a year.
Breastfeeding Counselor with Breastfeeding USA
Babywearing Guide ** Newborn Carriers
Cloth Diaper Guide
Safe Bed Sharing Info
i would agree that 4 is the bare minimum and possibly not enough... but i dont know if you're also feeding during the night, cuz that would help add some more nutrition for LO. we dropped to 4/day around 7-8 months but i've always nursed during the night too.
i've heard that people drop to 3/day when the LO drops to just one nap a day, which is usually around a year old. but different for everyone i'm sure!
this!!! DD was nursing 5x/day til a couple of weeks ago, and still nurses 3-4 times a day and will be 1 tomorrow