1)they're testing you for everything and I mean everythings(stds,problems iron, etc
2) like dani said there is b/c u can take when breast feeding alothough most drs wont give u a prescription till ur 6 weeks appt and dont recommend sex until then!
3) I breastfed my daughther the first month/my son for a day I dont like the afterpains and feeling depressed which I found rbestfeeding made me feel so I swear by formula
4)the reason babys have looser stools(diarhea is considered to watery stools more than twice a day) on breastmilk is because it is easier to digest it looks yellow with cucmber seeds(which is also common in formula with dha&rha) formula contains more iron making babys crap harder and it does stink
honestly I think breastfeeding/supplementing with formula is great if I wasnt in so much pain I would have brestfed cam longer(the more kids u have the worse the afterpains get it feels like ur going through labor again(contractions are incredibly strong)
formula can get expensive