I am an IT employee, I've worked totally for 3 organizations until now.
In the second organization I worked only for 45 days while in third organization I completed 3 years. Now I am going to join 4th organization but I have not mentioned 2nd organization name to 4th employer nor in their back ground verification form.
Can it cause for termination if background agency reach out to my 2nd organization details?
Mentioning 45 days work experience during an interviewer will largely depend on how you spent those 45 days and the auspices under which you left. If you were terminated for whatever reason, you probably shouldn't mention it. If, OTOH, you can use it to market and otherwise propel yourself forward, I would totally use it if I were you, especially if you left under your own terms to work on something bigger and/or to to further develop your skill sets. Bonus: if you have some kind of quantifiable skill set you've attained as a result of a project that you worked on during those 45 days, then all the better.