Spongy brakes on 09 Ninja 250

Ok so have done 3,000 km on the Ninja, and don't really think that should warrant spongy brakes, but maybe it does. Question would it be worth bleeding the brakes and putting in new brake fluid.
Being a newb yeah I may use the brakes a lil more but I don't grab them going through corners or anything like that on the odd occassion I set up before a corner using them but generally use the gears and have used the gears a fair amount to try and slow down when approaching lights or other stopping situations unless have to do an emergency brake but yeah just in the last week or so the brakes have felt not as firm as they did to begin with, any ideas or is it possible I am using the brakes a lil more than normal, or is it just general wear and tear.
Sanks
Dizzmister
Being a newb yeah I may use the brakes a lil more but I don't grab them going through corners or anything like that on the odd occassion I set up before a corner using them but generally use the gears and have used the gears a fair amount to try and slow down when approaching lights or other stopping situations unless have to do an emergency brake but yeah just in the last week or so the brakes have felt not as firm as they did to begin with, any ideas or is it possible I am using the brakes a lil more than normal, or is it just general wear and tear.
Sanks
Dizzmister