Here's a checklist of what you should have on hand before your baby arrives.
Tooling around
__1/1__Car seat.

__1/1__Stroller.

We thought we were off on the right track with one category filled, but then we continued to look down the list and realized we have a long way to go.
Beds and linens
__1/1__Crib.

__1/1__Crib mattress.
__1/1__Bassinet/cradle (if you don't want to put your baby in a crib right away).
__1/3__Two to three fitted crib sheets.
__4/4__Four or more waffle-weave cotton receiving blankets for swaddling baby
__1/2__Two mattress pads.
__0/2__One to two waterproof liners (for crib or bassinet).
Diaper duty
__0__Diapers.
Disposables: One 40-count package of newborn (birth weight under 8 pounds) or of size 1 (birth weight over 8 pounds).
Cloth: Two to three dozen, plus six to 10 snap-on, water proof outer pants, and two to three sets of diaper pins, eight to 10 all-in-ones or diaper system covers;two to three dozen diaper system inserts (none of these for us, thank you).
__0__Diaper pail (with refills or bags as needed).
__0__Diaper bag.
Dressing baby
__4/4__Four sleeping outfits or one-piece sleepers with attached feet.
__0/6__Six side-snap T-shirts. (Do you really need these???)
__4/6__Four to six one-piece undershirts that snap around the crotch.
__2/1__A small baby cap (although the hospital will probably give you one).
__0/6__Six pairs socks/booties.
__way too many/2__Two to three soft, comfortable daytime outfits.
Get only a few items in newborn size. Then, go forclothing in the 6-month size--your baby will grow into it quickly. But don't buy baby sleepwear that's too big--it's a safety hazard.
__0/1__Cotton sweater or light jacket.
Summer babies
__0/1__Brimmed hat.
Winter babies
__0/1__Snowsuit with attached mittens or fold-over cuffs, or heavy bunting.
__0/1__Heavy stroller blanket.
__0/1__Warm knit hat.
Feeding time
If you're planning to breast-feed:
__0/3-5__Three to five nursing bras.
__0/1__A box of washable or disposable breast pads.
__0/1__Breast pump if you expect to use one (manual or electric).
__0/4__Four small baby bottles with newborn nipples for storing expressed breast milk.
__0/1__Bottle-drying tree.
__0/1__Bottle brush.
__0/1__Insulated bottle holder for diaper bag (the hospital may give you one).
__0/3__Three packs of cloth diapers or burp cloths.
If you're planning to bottle-feed:
__0/4-5__Six 4- to 5-ounce bottles, plus nipples, rings, and a dishwasher basket if you use a dishwasher.
Bathing/Grooming
__0/1__Plastic infant bathtub.
__1/3__Three soft hooded towels.
__1/2__Two packs of baby washcloths.
__0/1__Baby body wash that doubles as shampoo.
__0/1__Pair of blunt-tip scissors or baby-sized nail clippers.
__0/1__Zinc-oxide-based diaper rash ointment.
__0/1__Soft brush and comb.
__0/1__Mild laundry detergent.
Medicine chest essentials
__0/1__A pain-and-fever reducer recommended by your baby's doctor, such as Infant's Tylenol.
__0/1__Cotton pads/swabs.
__0/1__Nasal aspirator.
__0/1__Digital rectal thermometer. (Don't know about the rectal part; maybe an ear one or something a little more humane!)
__0/1__Rubbing alcohol.
__0/1__Petroleum jelly.
Keeping baby happy
__5/4__Pacifiers.

Extras: Nice but optional
__0/1__Baby monitor.
__0/1__Changing table.
__0/1__A rocker or glider.
__0/1__Sling or strap-on soft carrier.
__1/1__Boppy, a doughnut-shape pillow designed to make holding baby during breastfeeding or bottlefeeding easier (although we don't have a pillow case for it yet).
__0/1__Nursing coverup. Attaches at your neck and allows for private breastfeeding when you and yourbaby are in public.
__0/1___Infant swing.
__0/1___Bouncy seat.
__0/1__Night-light.
As you can see, other than the traveling system, sleeping system, and everyday clothes, we have quite a long way to go!