My girl/boy twins just turned 4, and their big sis was 4 when they are born. Congrats! You will have your hands full, that's for sure :)
Mine were in the same crib for about 4-5 months. We went to a multiples class through our hospital and it was highly recommended to share a crib. They usually end up sleeping better. At the time, I think my boy cried most of the night while his sis was silently and peacefully asleep through it all!! (They still share a room & have bunk beds & sleep better together than apart.) We rolled up a towel and used it to divide the crib in half. They were fine and we only separated them when they started to roll into each other. Later, their cribs were on opposite sides of the room, and at 10 months old, my son would climb out of his crib silently EVERY night and climb into his sister's crib :) It still is one of my most treasured sweet twin memories....waking up to find them in the same crib, sitting up talking, smiling, playing, totally content with each other's company.
I had a healthy and uneventful pregnancy. My doctor and specialist (spec was assigned immediately since twins are automatically considered a higher risk pregnancy) both feel that 38 weeks is full term for twins. Both also agree that a c-section isn't necessary as long as there are no complications and as long as Baby A is not breech. My Baby A was my daughter and she did flip breech at about 30 weeks and there was no turning back. So I did have a c-section. Mine was at 36 weeks. They knew both babies were above the average size of a single 36 week baby (5lb 6oz is average & they thought mine were measuring considerably bigger, but they were 5#7 and 6#1, still perfectly healthy). I was really uncomfortable and at the weekly stress tests my contractions were always regular. In my case, they only reason they didn't let me go another 2 weeks was because my hospital & doc was 35 miles from home and because we knew I'd have to have a C they did NOT want me to go into labor and turn a planned C into an unplanned emergency in which I'd likely have to go to another hospital with other docs, etc. They were a little smaller than we all thought, but still wonderfully healthy and came home with me at the same time.
I used my previous maternity clothes and bought a few bigger shirts. I'm short, but still the longer shirts were necessary because by about 32 weeks, nothing was long enough. The tighter shirts were actually great because they clung to my obnoxiously large baby belly and stayed put :) I started out kind of overweight, too, and I swear, with my short torso my babies were starting to wrap around the sides of me...haha :) I got mine at Motherhood and Target.
I breastfed, but at the multiples class (I think it was called Marvelous Multiples and is offered at lots of hospitals), they gave us TONS of info about where to write for free stuff. Lots of it was formula offers, and you'd have to fill out a form and include copies of their birth certificates. I also got coupons for free diapers from Pampers, Huggies, and Luvs by doing the same. When you leave the hospital ASK your favorite nurse for free stuff. Do not hesitate because a good nurse will give you TONS of stuff. I think we left with 10 full packs of preemie Pampers and 4 cases of glass jar formula in case we wanted to supplement. I did breastfeed, but my friend had a baby on formula and we traded. I gave her all my free formula and she bought me diapers :) Speaking of diapers... HAVE A DIAPER PARTY. You will never in your life have imagined that many dirty diapers :) In the beginning, we went through at least 30 diapers A DAY!!! Have a friend help plan a little get together. Mine was really fun & turned into a full shower. We rented out a park district facility and had a party w/ simple catered food. Entrance was a pack of diapers. Many people brought more than diapers, and we were grateful.
(When our babies were born, we had a small "big sister" party w/ family, close friends, cake & balloons so SHE could have a special day since everyone was so interested in the babies. Your son will be old enough to notice that everyone is there for the babies, so don't forget about him :) My poor daughter was like the invisible child for the first year and it hurt her at 4 yrs old. Since then, whenever a friend has a 2nd baby or 3rd, we only give big sis/bro presents & cards.)
My best advice to listen to your doctor and pay attention to your body. Ignore the people who say you shouldn't be out or you look like you'll pop. Be prepared for the touchers and the askers. The first time you're publicly out pushing that double stroller around or carrying 2 carriers people swarm to touch them and ask if they're twins. Then they want to know their names. It gets old fast, and old ladies and well-meaning nosey folks start to feel the paparazzi at the grocery store, but I kept a good sense of humor about it.
Just relax & enjoy your son while he's still the only :)
Best of luck to your family!!
A.
I just want to add that while the Mothers of Twins clubs here were great for people with just twins, or twins first, they were NOT good for me with my already single kid. In our case, the focus was solely on twins, twins, twins. For me, going to their events was almost harmful for my 4 year old as she was constantly excluded from the specialness of having a twin present. Because I already had one, I have always raised mine to be 2 individuals. Their bond is undeniably strong, but so is their bond with their big sister. I will not allow for them to be called "the twins" in school or otherwise. I have 3 kids, not 1 and twins. For our family, this was best. We celebrate them equally and individually. Perhaps it was just our twin clubs here, but they were over the top exclusive to twins so they didn't work for us. Now, at age 4, they will say themselves that they are not twins and just brother & sister with the same birthday. I now know many, many families with twins and the ones with just twins or twins first are so much different than those who had a single child first. It's not bad, it's just different. When you become a family of 5 like this there is always "mom & dad", "twin & twin", and then "just me" for the single kid. In our case, the feelings of isolation were incredibly sad for our daughter who didn't have anyone to pair up with by default, so we were quick to stop that. Again, just my 2 cents :) Not trying to take away from anyone else. Good luck!