Taxes the first year can be very complicated. Income of foreign spouse, tax treaties, etc. all come into play. I always advise first year residents to consult a competent tax professional. I'm glad you did. I was just qualifying what you said. But yes, all income for entire year must be properly reported if filing a joint return. Good luck.
Note: I have a very, very good CPA. In 2017 (wife's 1st year), my wife and I filed Married-Filing Separately., thus the "entire year" wasn't applicable.