Hey V.. Boy do I miss College Station. Lived there 8 years. Taught in Bryan.
Anyways, like others said, your son needs breastmilk or formula until age 12 months. If you're not annoyed or ready to be done with Breastfeeding, then I would suggest you continue to pump for him, as it is healthier for him than formula (and cheaper!).
When my son was 1 year old, he was nursing 6 times a day, yet he was getting so active that he started weaning himself off the breast only wanting 5 times. So I skipped the 'after breakfast' nursing and gave him a sippy cup with whole milk instead (but only do this after he turns 1 year old!). So when he got used to 1 feeding with whole milk and 5 nursings, we cut out one more nursing, so he took his sippy cup for 2 of his regular feeding times and nursed only 4 times. We kept this up until he was only nursing before naptime and before bedtime and was drinking milk from his sippy cup all other times. The last feeding to go was the night time going-to-bed feeding and my body just got the message that I wasn't feeding him as much, so my body started producing less, and so I dried up.
For you, since your pumping, then I would try a similar approach. Tell your body that you're going to start cutting out he 10am pumping session by pumping only 2-3 oz to reduce engorgement and pain. You'll probably have to do this for about a week. So now you'll pump at 6am, skip the 10am (pump a little if need be), then again at 2, then again at 6pm ..... Then after youre done with the 10am pumping session, try getting rid of the 6pm pumping, so that you're pumping at 6a, not at 10a, then at 2p, not at 6p .... Do you get it? Sorry if it's hard to explain. Now at the same time, I would suggest whoever is taking care of your son give him formula or whole milk (at 12 months) in place of breastmilk so that he gets weaned and your body gets weaned too.
Good luck. Sorry if what I said was confusing!