Why the voiceless dental fricative /θ/ omitted? I couldn't hear /θ/ in months. I do mean when the s plural being added there is no /θ/ at all. It is at the first minute time (0:42).Ambassador Rice: Anti-Islam Film Responsible For Attacks, Not Administration's Policy - YouTube!
In careful speech, the /θ/ is pronounced. In less formal speech, the word may be pronounced as though it ended in/ts/ or even /s/. This is quite normal.