Not an exhausive list, but things I've thought of:
-A good book, a laptop with wifi, a journal-- there is a lot of sitting and waiting at the bedside time potentially. Good time to get thank you cards written for baby gifts you got/ will get.
-How far is your house from the NICU? If it's too far you should figure out a place to stay nearby for after you are discharged as a patient.
-Find out visitor policy, as your kids might not be allowed in at all, but even if they are I'm sure they won't be up for visitng long, so childcare arrangements, or lots of things to keep them entertained in the waiting room.
-I went to the hospital from work, thinking I was getting a UTI checked out, and ended up being fully dilated so I obviously didn't have anything with me, and that was fine. We eventually packed clothes (we are staying with family near the NICU), books etc as above, and I also recommend a big water bottle and coffee mug. But I don't have any other children.Â
-You will be spending exceptionaly amounts of time pumping, and you can use the hospital pump while you're there but you'll need to arrange for a hospital grade rental for when you're not there, so check with insurance, find out where to get it, etc. And some breast gear- obviously nursing bra but also breast pads, lanolin, etc.
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I think your biggest challenge is going to be your older children and I don't have advise there.
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Best of luck for a long pregnancy- every day counts! It sounds like you have done great with an already long and challenging road, and its great to have made it to 30 weeks.