Hi thanks for your question.
Newborns are prone to frequent respiratory tract
infection more so when they have low birth weight
,(your child had adequate) which causes fever.There are many causes for fever in newborn and good physical examination supported by investigated by to determine the cause of fever.Montair containsmontelukast sodium which is used to treat and prevent asthama and allergy.Ibugesic is ibuprofen which is stronger antipyretic
.I would suggest you to consult a childeren specialist who may examine and investigatr your child for fever and may prescribe him drugs accordingly.
Hope this answers your question.