All you need to do is - giving anything (cardboard, paper towels, even paper roll) a shape like a tube, placing one end to your baby's ear and you softly talk to the baby from the other end of the tube. (welcomeparenthood.com)
In this aspirator, a tube goes into the baby's nose, and the suction is created by the parent sucking on the other end of the tube. (newkidscenter.com)
You simply put the end up against the baby's nostril and suck on the mouthpiece at the other end of the tube. (wichitadoula.com)