Excellent that you are trying to get him back on course instead of throwing in the towel. My goal for my baby was to make it to his second birthday. (I got that from recommendations from the World Health Organization) Anyway, we made it, but we had help from an IBCLC, Kellymom, and articles by Dr. Newman (you can find em online.)
Your problem is a "nursing strike" and it's fairly common.
If your supply has dropped, the baby may become less interested, and less nursing can further drop supply, so you may need to pump to keep up supply until you can get him back on track. Take steps to increase your supply. Offer nursing BEFORE solid foods. Solid food should never become more important than breastmilk in the first year. Limit (or eliminate) bottles, pacifiers, and sippy cups. Offer nursing freely, don't wait until he "demands" to nurse - the "don't offer, don't refuse" method is a weaning technique. (One you might consider later on, as it is one of the more child-friendly weaning techniques)
He might just be too distracted, though. Have you heard of a "nursing necklace"? Or any beaded necklace that's STRONG enough that the baby won't break it. The mom wears it, and it gives the baby something interesting to play with or explore while nursing. Or a small toy to play with shile nursing (but if it's not attached to mom, he may just take it and crawl away with it.) Here are some more tips on nursing strikes and weaning from the Kellymom website:
http://www.kellymom.com/bf/weaning/babyselfwean.html#tips
"The Distractable Baby"
http://www.kellymom.com/babyconcerns/distractible-baby.html
And you can find a list of links here for help on "Surviving a nursing strike"
http://www.kellymom.com/bf/concerns/baby/back-to-breast.h...
Here's a (long) quote from the page entitled "Do babies under 12 months self-wean?":
DEVELOPMENTAL MILESTONES
"It is common and normal for babies to show less interest in breastfeeding sometime during the second six months. This is developmental and not an indication that baby wishes to stop nursing.
"Older babies tend to be distractible and want to be a part of all the action around them. Your baby may be more interested in learning about the world than in eating during the day (these same babies often increase their night nursing to make up for their busy days).
If baby is being given a bottle or sippy cup frequently, he discovers that he can walk/crawl around with it and not miss a thing, whereas nursing generally requires sitting still and not looking around for a few minutes. For this reason, some babies develop a preference for the bottle or cup at this developmental stage.
"Milestone times, such as crawling and walking, and stressful times like teething or illness can also cause baby to be less interested in nursing - these types of things are common in the second six months. Nursing strikes (when baby quits nursing suddenly) also tend to be more common around this age, perhaps due to the same factors.
"Our society tends to produce the expectation that babies can and should become independent as quickly as possible. Babies are considered more independent when they sleep alone, sleep through the night, potty train, wean, etc., As a result, babies are often pushed toward these milestones before they are ready - emotionally or physically. Because of this societal mindset, many moms don't even consider the idea that baby's disinterest in breastfeeding might be temporary, but simply go ahead and wean.
"This is not saying that a mother's choice to wean a baby this age is necessarily a bad choice for her family. A mother who wishes to wean her child at this point can certainly take advantage of baby's temporary disinterest in nursing to initiate mother-led weaning.
"However, it should understand that this is not self-weaning but a temporary developmental stage. Mom is making the choice, not baby. Once mom knows that she has a choice in the matter, she can better make an informed decision of whether to wean or to seek the benefits of continued nursing."