The rapid growth of wireless technologies enables continuous healthcare monitoring of mobile patients using compact biomedical wireless sensor motes. The power available in these sensors is often restricted because of the size of the battery. In a lot of applications, a Wireless Body Area Network's sensor should operate while supporting a battery life time of months or even years without intervention. In order to limit the sensors' temperature rise and in addition to save the battery resources, the energy consumption should be minimized. Thus we propose in this paper a cross layer energy saving solution in WBANs. As the wireless communication is likely to be the most power consuming, we base our work on reducing the number of packet to be sent to the freshest ones. Moreover, an intelligent cluster head selection algorithm is presented.