As you know this is my first too, but I've been thinking a lot about the hospital bag and I don't think we need to take EVERYTHING for the baby, especially if you're the "make do" type as I am.
For the baby I'm taking a handful of babygrows, a cardigan and a cellular blanket, a couple of soft bibs and a couple of muslin squares, a pack of newborn nappies and some of those huggies pure wipes, vaseline (after someone said smothering baby in vaseline stops "marmite" meconium poos from sticking)
That's as far as I'll be going with baby toiletries for the first few weeks, apart from maybe a dot of baby shampoo when we're home to wash his hair once in a while and a bit of bepanthen if he shows any sign of nappy rash. I don't think you'll need infacol etc in the hospital bag. I don't think they get colic in the first few days (but please experienced mums, correct me if I'm wrong on any of this!)
The arnica tablets are to bring out and heal any bruising you may sustain to the perineum and also helps you heal internally. No idea of the dose though as I haven't bought any. The kamillosan is for cracked nipples during breastfeeding, I would take that with you to hospital, you'll kick yourself if you have nothing with you and they get sore. I've heard you can use kamillosan as nappyrash cream and even lipbalm so it's probably a good allrounder!
I have no idea bout taking formula milk or anything as I'm hoping to breastfeed and I don't want to jinx it by buying bottles and formula. Am I being silly?
As for my bit of the hospital bag, I'm taking two nighties, dressing gown and pyjamas, flipflops, towels hairbrush bobbles toiletries and makeup, dry shampoo for "straight afterwards" pics, a soft flannel or two, 3 packs of lucozade tablets for energy, a box of cereal bars, some cartons of juice, nipple cream, breast pads, nursing bra, maternity pads, a toilet roll (just in case) and some baby wipes, cheap tesco knickers, rescue remedy, paracetamol, change for the phone, camera and film, outfit for going home, post-it notes and pen, and a book/magazine or two.
Seems like loads but I've probably forgot half of what should be on there...