loving neuter your bitches and humpers GOD DAMN IT ARGENTINIANSThere is always a chance puppies might die, but, y'know, nature. But really, the mother should be able to deliver all with instinct. Don't touchy touch if your life doesn't depend on it.
Also, the mother
is ready to give birth. Expect whelping to occur in within 12 hours. I see you have a whelping box ready, good.
But yeah, you'll know if a puppy gets stuck (probably won't). Further, placentas will usually arrive with the puppy and if they won't they will come after every puppy is out. Further, if a mother -forgets- to stimulate breathing (she does this by licking the puppy to rid the sack around it and well, stimulate breathing) MAKE SURE you use a CLEAN towel to rub the puppy. You'll know you did a good job if the pup coughs/does breathing thingies/starts to cry. Something about liquid being in the airways is around from what I remember, so just watch a video or something.
Give this a quick check if the mother doesn't do all the things her instincts tell her to do!
http://www.cesarsway.com/dog-care/puppies/quick-tips-for-delivering-puppies(cesar might not be the best trainer but my mom's friend said she "likes the site's way of explaining it")
ps: mom's friend is a breeder, watched a golden retriever give birth.