I'm packing for a holiday with 3 children and an infant.
We are flying to Spain.
Can anyone tell me something I've forgotten.

passports -usually the case - no passport no holiday

High Factor Sun Cream?
Calpol?
Children?

make sure u pack things that will keep the kids entertained while on the plane
cause if their not entertained then they willl get bored and start winning and crying

National Health cards for everyone (replacement for the old E111).

boiled sweets for the ear popping experience for the infant you can get headphones that go over the ears to help balance the pressure.

with young kids you wont need the alarm clock so put it back.

also if you are bottle feeding I recomend you take your own new travel kettle to avoid the scummy bits in the young ones bottles

wet wipes,annadin for you!! have a gr8 time.

-Health insurance (just in case!!!)
-VERY high SPF for your kids (especially the infant, who should never even be exposed to direct harsh sunlight) - I recommend 60SPF even for adults' faces
-any prescription medications
-lists of what they're allergic to in Spanish
-learning key phrases just in case you're somewhere where they don't speak English and your children (or yourself) get hurt
-a book with pronunciation and phrases in Spanish
-toys or books to keep them occupied on the plane or in cab rides, or when you want some quiet time in the hotel - colouring books are wonderful distractions for them
-a digital camera to capture all the memories of your children's first trip to Spain
- extra changes of clothes in case they get into something messy on the trip on the last day and you've run out of clothes for them
-sunglasses and hats for them all
-definitely don't forgot any travel documents for them (passports, birth certificates or whatever you may need, you'll know better than me what's required for kids to go to Spain)

Have a fun time. I'm so jealous. I'm sure you'll end up forgetting something minor like a toothbrush (I always do! :P). Bon Voyage!!!

**Before you land, to help with ear popping, give your children chewing gum if they're allowed to have it. I chew on ice because I have really bad problems with landing and ice totally works (and no it doesn't ruin my teeth haha). Gummy bears might be O.K. too, I doubt you have to go spend money on something to ease the ear popping.

pack and play
stroller
passports
firstaid kid
camera
childrens tylenol
vicks vaporub
benedryl
earplanes for the kids(link)

http://www.target.com/gp/search/602-2701354-5432603?ie=UTF8&ref=tgt%5Fadv%5FXSJH1060&afid=yahoosspslp&lnm=earplanes%20ear%20plugs&field-keywords=earplanes%20ear%20plugs