NUK Nasal Decongester Product Features & Benefits A cold can take its toll on a baby because, at the start, a baby breathes solely through its nose. A blocked nose can thus interfere with feeding, unsettle your baby and make it hard for him to sleep. With the NUK Nasal Decongester, you can unblock your baby’s nose safely and gently: Simply press the pump bulb together, carefully hold the nozzle to one of your baby’s nostrils and keep the other nostril closed with your finger. Slowly release the pressure on the bulb and your baby’s nose will start to decongest, releasing the mucus. The wide safety nozzle prevents you from inserting the decongester too far into your baby’s nose. Comes with extra nozzle