Baby’s sleep shortly after birth?

Mo

I have an 11 day old son as well as a 2yo. I recall a horrible few nights (maybe a week? Maybe less or more?) where my then-infant, now 2yo was up all night, mostly crying, so that made 2 of us...

I just can’t remember when this happened...after a couple weeks? Or a month in? If anyone can relate and can remember when this happened to them, I’d love to know. My husband is going back to work next week but can plan to take a few more days off here and there...I’m just trying to guess when might be a good time for that.