hi,
um.... you are feeding him other than the bottles, right? ( :oops: not trying to sound snotty, i swear! :oops: just making sure he's not hungry....)
the only other thing i thought of was that your afternoon nap might not be late enough??? dunno, only have my kids to compare to, but luke's morning nap is around 9:30, and his afternoon nap starting somewhere around 2-2:30.
at this point, i wouldn't worry about a shorter morning nap, since he will probably drop it soon, but i would definitely focus on the afternoon one.