Article in English: Place the infant on a flat surface and position a rolled towel beneath their shoulders to tip their head back.  Place a few drops of saline solution in each nostril. Saline solution breaks up the mucus so it can be removed, allowing your little one to breathe more easily.  To make your own saline solution, mix 1/4 teaspoon (1.42 grams) of non-iodized salt with 1⁄2 cup (120 mL) of filtered or distilled lukewarm water. If you only have tap water on hand, boil it and allow it cool before using to make a saline solution. Otherwise, you could introduce bacteria or amoebas into your child’s sinus cavity, which, while rare, can be life-threatening. If your child is old enough to blow their nose, have them do so gently. If you have an infant, use a bulb syringe to remove excess mucus from each nostril.  First, squeeze out the air in the bulb, then carefully insert the tip into one of the baby’s nostrils. Release the bulb to suck up the mucus, then remove it from the nostril and squeeze out the mucus onto a tissue. Repeat on the other side. Alternative, roll a tissue into a small cone and swab it around the nostrils. Do not insert cotton swabs into an infant's nose. A cool-mist humidifier can soften mucus and ease your child’s breathing. Set up the humidifier in their bedroom and run it throughout the night. If possible, fill the humidifier with filtered water. Be sure to clean it weekly to keep germs from spreading. However, if you don’t have a humidifier, you can run a hot shower and sit with your baby in the bathroom (not the shower itself) so the steam loosens up the mucus. This is especially helpful if your child has a croupy cough. Roll up a towel and place it under your child’s crib mattress. Rest their head on the elevated portion of the mattress to allow mucus to drain away rather than clog up their nostrils as they sleep. Never elevate your child’s head using a pillow as this can increase the risk of Sudden Infant Death Syndrome (SIDS). Over-the-counter cold medicine is not suitable for children under 4...

Summary in Vietnamese:
Dùng dung dịch muối nhỏ mũi để làm long dịch nhầy. Hút dịch nhầy để giúp trẻ dễ thở hơn. Để máy tạo ẩm phun sương mát trong phòng của trẻ sơ sinh. Cho trẻ nằm cao đầu khi ngủ. Không cho trẻ uống thuốc cảm.