XP: Not talking as much...

kmpage28

A few weeks ago (around 9-10weeks) our LO found her cute little voice and would coo or talk to her dangling toys etc...Over the past two weeks or so, she hasn't been doing much talking at all (she is 13 weeks today)...She has in this time discovered her hands and love of putting them (and other things) in her mouth...Should I be concerned that she hasn't been "chatting" recently?