You should make copies of all of your documents and store them in a separate piece of luggage
Passport (keep with you at all times)
US Agency address & phone numbers
India agency/orphanage address & phone number
Hotel address & phone number
Airline tickets and itinerary

There are laundry services so you don’t need to pack too much
backpack and fanny pack
2  skirts
3 short sleeve blouses 
2 salwaar kameez
2 pair sandals (comfortable!!)
1 sleep shirts
One pair pants (not jeans)
One sweater (if you'll be in an area where it gets cooler)
watch

Child’s Clothing:

I was not sure of Elina's size so I brought between 12m and 18 month size
She was 19 months and it fit just right !
3 dresses
2 onesies (for sleeping)
4 socks (easy to hand wash)
one pair shoes
2 blankets
One sweater (if you'll be in an area where it gets cooler)

2 toothbrush (one infant)
toothpaste
shampoo (baby)
soap
toilet paper (I didn't need the one roll I brought)
lotion
q-tips
kleenex (little travel packs)
anti-bacterial wipes (bring lots, as we used them often especially where there was no soap & water)
diapers (small size as she was only 17 pounds)
travel wipe container
razor/shave creme
Any medications
Tylenol (and infant tylenol)
Pepto Bismol and Immodium 
Acidophilus capsules
Infant thermometer
Anti bacterial ointment for cuts
LICE shampoo (get the kind that kills eggs too)
scabies medication

pedialyte
platex type bottles w/disposable liners
formula (powdered)
adult oral rehydration (powdered)
Granola bars
peanut butter crackers
pretzels (Elina liked the big ones)

Other:

Woolite (I brought dish soap actually so I could also do baby bottles too)
baby carrier! (Sara's Ride is excellent! Packs into the size of a pair of socks. Highly recommend this carrier!)
notebook & pens
zip lock bags various sizes (they’ll come in handy)
couple of small trash bags
bug spray
small first-aid kit
swiss army knife
small sewing kit
Flashlight
batteries
BOOKS to read
Travel alarm clock
camera and lots of film ( I took 10 rolls along and wish I’d taken more)
Video camera, tapes & batteries
calculator (didn't really use this)
luggage locks
Gifts for friends, other children at the orphanage and Ayahs (caretakers)
I brought pens because I was told that good pens were hard to come by in India. I passed out lots!