My newborn kitten has asperated what to do?

We found these two kittens in the weeds by the woods they still have eyes parcially closed. I have been feeding them some milk for kittens. They dont know how to suck on nipple of bottle so i put a drop in at a time. The runts lungs r making noise so i ume that she has asperated what should i do besides rub his back or pat his back? need to clear his lungs or he wont survive the nite.