Hi Paris.
Congrats on the new little one!
I have to say that I went back to work when one son was 3 months and the other one was about 6 weeks.
I found it was actually bait easier because there were other children keeping my older ones busy. Let the parents know that during quiet time or nap time you might be crashing on the couch for a bit of a power snooze.
Another thing is get the older kids involved in helping, they love being little Helpers. Show them where the diapers and wipes are. Where the re Irving blankets and baby toys are kept. They will be more than willing to run and grab things for you, as long as they are in places they can reach.
Good Luck!!