I remember those days - the first six - eight weeks. The baby learning day from night - operating on no sleep. It's not easy with just one, and with two - well that's just not something I am looking forward to either. Can you nap during the day?I assume the older one no longer naps, but can you arrange to have a few hours to sleep in the afternoon?
No advice - just empathy.
And just know that this will pass - fast.
No advice - just empathy.

And just know that this will pass - fast.