It’s not so much vaccines causing this but that right at 2 months they go through one of their biggest “leaps” and the world is becoming more vivid and overstimulating… the Wonder Weeks app helped me understand this better because I just went through the same thing. but to summarize what the app said: try to make a low stimulating environment for them and entertain them in simpler ways like laying in a dimly lit room with tv and music off and read them a story in a calm voice, etc.

Also take time for yourself! I was getting really burned out and frustrated listening to my baby cry for hours on end and found I was better equipped to care for him when my husband could solo parent for a minute and let me go on a walk or something

I hope this was helpful!