soooooooooooooo 
Baby piglets are gorgeous. (my pigs had unexpected litters when I was a child, so we had newborns) They fit neatly in your hand -you might need to cup your other hand over your pig if they are the 'daring,flying leap variety' !
They will be very timid to begin with.Even if they have been handled before their new home is completely new -new smells, new noises, new voices. All they know is each other.
You'll find out who the bossy one is, who's the meek followers.See who is first at the food bowl and who pushes the other ones out of the way.
If you've got boys, you'll need to get them off to the cavy-savvy vet to have their Gentleman's Operation, otherwise they'll quite happily get their sister pregnant, then when they reach their terrible teens (about 6 months) there will be arguements between the boars, if there is competition for a female. (Our two boys are un neutered but they are pure like the Jonas Brothers- no girls)
Or are all your pigs girls? (Twins and a sister)
Food-wise: they like a selection , but be careful with lettuce. No iceberg, it's too watery.Other lettuce is ok.
We tend to give a leaf (cabbage), rocket, carrot, pepper, some fruit once or twice a week and parsley twice a week.
At the moment ours are scoffing grass and dandelions.
Check their droppings as well (they will be tiny!) -though with more than one you can't tell whose is whose. Check their bottoms are clean, runny bottoms might mean they are eating too much veg.I've had pigs with soft poohs (one of our boars does huge soft poohs at certain times, but never had one with proper diarrohea.)
Fresh water at least once a day (and maybe two bottles) fresh pellets daily -baby GPs sit in their bowl and of course, they pooh in it. Veg twice a day, and take all the bits they 'hide' in their bed for later.
Are your piglets inside or outside at the moment? If they are in, have you had the "Wheek Wheek" when the fridge is opened, or you chop something? Our boars used to grass me up when I was eating a late night bag of crisps.
Enjoy their baby stage, take lots of pics, you'll look back and think- were they ever that tiny?