"The American Academy of Pediatrics (AAP) recommends that breastfeeding continue for at least 12 months, and thereafter for as long as mother and baby desire. The World Health Organization recommends continued breastfeeding up to 2 years of age or beyond." -cdc.gov
And here we are, at 12 months. Some people may be wondering when I'm going to quit exclusively pumping milk. I think, first, that would be mixing up the maximum and minimum from the above statement. Second, guidelines are based on the average baby. (Mine is definitely not average, and neither is yours I am sure!) Finally--it's gotten to be such a part of the routine that another few months won't hurt.
Like I did before starting solids, I am watching for signs that Sam is ready for something new. When I see things like eating solid food as if he's actually hungry and not just playing, tasting, and practicing. When he starts drinking out of a cup without choking. When he says "no thanks" to the bottle a little more often. I'm not seeing any of this yet, so he'll keep getting breast milk for now.