If your one and a half week old baby has frequent runny nose and sneezing, and the sneezing tends to be continuous, then your baby may have allergic rhinitis. First of all, we should pay more attention to see what the baby is allergic to, such as what will happen after contact with this allergic reaction, the most common are dust mites, pollen, animal dander or changes in temperature. If you are allergic to dust mites, you should pay attention to what your baby is using, such as bedding and cotton clothes, and wash them more often, especially bedding containing cotton wool, which can easily harbor mites; if you are allergic to pollen or animal dander, you should try not to keep flowers or pets indoors; and if your baby is more sensitive to changes in temperature, pay attention to changes in the temperature difference, and pay attention to the addition or subtraction of clothing. Finally, you can use saline to spray the child’s nose, play a role in cleaning the nasal cavity, can reduce the concentration of allergens, reduce the number of baby sneezing as well as the extent of the attack.