When learning a new song and trying to figure out the intervals, a quick fix is to identify with a “tune” that is familiar.  Enjoy this help.
 
 
https://www.earmaster.com/products/free-tools/interval-song-chart-generator.html
 
An understanding of solfege syllables are also helpful.  Here is the hand signal chart that can be a great tool and some general information.
 
http://choirly.com/curwen-hand-signs-kodaly-hand-signs/
 
Dr. John Feierabend discusses his conversational solfege approach to becoming literate in music. Becoming tuneful, beatful, and artful are the key.
 
https://www.youtube.com/watch?v=btRL8PmmQh0