Labor/Delivery & First 48 hours with baby
Shave "down there" before you go into labor, or at least trim. Why? There is so much blood and gunk after birth that it will literally dry and your hairs will stick together
After a vaginal birth, your vaginal lips will be swollen so badly that you can feel them between your legs. Don't worry, it only lasts for a couple of days, and motrin helps.
If you get an epi during your vaginal birth, be warned that the nurse will ask you to get up and go pee a couple of hours after the baby is born. And by "ask", I mean that she will threaten to cathetorize you if you don't. It hurts, and it's hard....but do it anyway!
If you don't want an IV during your labor, make it known QUICKLY. Its the first thing they try to do when you check in to the hospital.
After a vaginal birth, the first time you get out of the bed, the room will look like a murder scene- blood everywhere. Totally normal and temporary.
Icy pads are a GOD SEND for the first few days after a vaginal delivery. Make sure that your nurse brings you a new one every couple of hours.
Make sure to use the peri bottle after a vaginal delivery. You don't want to have to wipe or touch down there, and spraying water is the easiest way. It will burn a little bit when the water hits, but its not too bad.
If you have the IV during labor (without or before epi) you will have to pee like a race-horse. Beware....it HURTS to pee during labor! Every time I peed, it started a contraction and had to get through it while still on the toilet. Its just part of the process....you'll never hate peeing more than when you are in labor!
If you have an IV, and especially if you get an epi (they pump you full of liquid to prepare for the epi) you will BALLOON. Your fingers will be sausages, your face won't look like your own, and your feet will be huge. It goes away
Take EVERTHING from the hospital- diapers, wipes, nasal aspirator, pacifier, pads, mesh undies, bedpads, blankets, hats, etc. You paid for it, so take it!
The first times that you breastfeed (for a few days after baby is born), you will get painful uterine cramps. The baby sucking will stimulate hormones that will naturally cause your uterus to contract, helping it get back down to a normal size. Cool in theory, but they HURT. Like horrible period cramps. I found mine so unbearable that I requested painkillers (600mg Motrin AND Tylenol with Codine....) This stops after a few days and is only really bad while you are nursing.
Don't wear anything at the hospital except for the provided gown, undies, and socks. Why ruin your own clothes? Just bring one outfit to wear home. I suggest cotton, stretchy pajama pants and a t-shirt.
If you are staying at the hospital for a day or two, try to get up and take a shower. It feels wonderful to clean yourself, and the warm water does wonders on a wore back and belly. Have your DH help you and BE CAREFUL as you may still be wobbly on your feet because you are sore. I had my DH use the removable shower head to have the water massage my lower back and he also helped me wash my hair.
Your baby's first couple of poops (meconium) are like gooey, black tar. Don't feel like you are screwing up if it takes you 12 baby wipes to clean. That stuff is crazy!
Once baby is home
REMEMBER TO EAT. Seriously. You will feel like poo if you don't, so force yourself.
Get some fresh air. Cabin fever isn't good for anyone. Go on a walk, take baby to grab a coffee/tea, visit a friend, etc. It will be scary to leave the house at first, but with each little excursion, it will get easier. And trust me, the worst that can happen is that you will need to change a diaper in the back or your car or whip out a boob/bottle.
Start a basic sleep "routine" early. The first few nights when you get up with baby, make sure not to turn on lights or move him/her around too much. They will start to learn that a dark, calm, quiet enviornment = sleep time.
If you have a little boy, don't panic if there is a creamy, salmon colored discharge in his diapers. I forget what its called, but it's normal and temporary.
If you're going to introduce a pacifier, I highly suggest the Soothie brand, or any other kind with that shape of nipple.
Get a mirror that allows you to see your baby in your rearview mirror while driving. It gives you the peace of mind that baby is crying just because he/she is pissed, and not because they hand is stuck under the seatbelt, etc.
Don't let your baby's head tilt too much to one side (in the carseat, swing, etc). It can lead to Torticollis. Try to keep their head from leaning too far over, even though they look comfortable with their ear on their shoulder
Once you find a brand of socks that actually stay on, buy 20 pairs of them.
Baby jammies with zippers are your best friend. Who wants to try and fasten 8 snaps in the middle of the night on 2 hours sleep? This is of course if you use jammies instead of a swaddle, and I reccommend a swaddle for the first couple of months.
Have clothes for yourself that are smaller than pregnancy clothes, but larger than your pre-pregnancy clothes. It's totally worth the investment to spend $20 on a pair of "transition" jeans so that you can leave the house in something besides sweats!
Walking may wear you out for a few weeks after you have the baby. If you tore or had stitches, your vajayjay might ache too. Take things slowly.
Accept any and all offers to help out around the house. The best gift anyone can give you after you bring baby home is to watch the baby (at your own house of course) for an hour or two so that you can sleep. You probably stayed up for over 24 hours straight during labor and delivery and you're not sleeping much as night. You NEED your rest, so don't feel like you are a baby mommy if you need a couple hours of solid sleep. Just have them bring baby into you if baby needs to nurse.
Have about 5 cheap sports bras to wear after baby comes home (3 pack at Wal-Mart for $9.99!) Even with breast pads, you will probably get milk on your bra, if you use Lansinoh nipple cream, it is greasy and gets all over....don't ruin a perfectly good (expensive) nursing bra. Save those for when you venture out or after your engorgement has gone down.
Stock up on cheap grannie panties. You WILL ruin underwear after you have your baby, even with the gigantic pads that you will wear. Also, since you will need to wear pads instead of tampons, you can't stick pads on all of those cute little thongs that you have

You need big undies!
Constipation is a very common thing post partum. Be prepared by having both stool softeners and laxitives at home, but make sure to ask your doc before you take them. My constipation was so bad that I was literally rolling around in a fetal position in pain.
Feel free to add to this list!!