i'm still battling the "mouthing" with fumble as well, and he's nine months olD! but as you said, ive realized that 90% of the time, when he "mouths" he's just grabbing onto me.. the way i figured this out is when he first started doing it he would get my hand or arm in is mouth and then not chomp down or bite, just take a hold of it! but the trying to figure out how to control it is a little frustrating! we've tried everything, giving him a toy to distract him, apple spray, everything.. i thought the spray would work, but fumble actually likes it! go figure! so i'm right there with ya! good luck!