7 month 20 days old baby not sleeping.

during teething (pain can start as early as 3 months) there is itching, pain, drooling of saliva, swelling in the gums, oral finger insertion, irritability and crying during the teething process. it will come intermittently for few days to few weeks and then will go away. usually teething pain doesn't come after 2 years of age. with the help of your fingers you can press the gums of the child to decrease the pain as well as you can give a pacifier but it should be clean. you can give a cold cotton cloth to bite and press between the gums when the child is crying due to pain not resolving then you can give paracetamol which will also help in decreasing the pain. long-term medicine on daily basis (homeopathic /allopathic )(they are painkiller)are usually not advisable.  

Visit to Pediatrician physically for further evaluation