Yay for newborns! I completely sympathize with you on the sleep thing, the breech thing & the c-section - all of what I experienced with my first son.
A few things: definitely be careful of using & thinking the word "should" when it comes to newborns. Just because a typical baby "should" be sleeping 16 hrs a day definitely doesn't mean they will or that it's bad if they aren't. "Should" be eating every 2 hrs, "should" be pooping at least once a day, etc.
You will learn over time that your baby is very unique, regardless if it appears everyone else's baby is the same! My first son slept maybe 10 hrs in a 24-hr period - not kidding. He also pooped every 10 days & he ate nearly every hour for a very long time - breast or bottle, didn't matter. He had a high metabolism & was (& still is) a very alert child.
REMEMBER: there are 3 things you can't make any child do: sleep, eat or poop. Seriously!! Yes, you can establish healthy routines for sleep, you can provide them nutritious meals & offer foods that help with their BMs, but that's about it!
Regarding sleep: if she seems irritable, over-tired, etc. after he's slept some, then that would indicate she didn't get enough sleep. Otherwise, go with the flow. I read the books & Weissbluth is definitely a good one. But the general fact is that MOST babies do not have their sleep patterns set until around 3 mths. My 2nd boy is nearly 4 mths now & I noticed his pattern established around 12 weeks or so. Still changes now & then - little surprises! But for the most part it's a pattern. Sleep training is typically ineffective until 12 to 14 weeks because of this.
Regarding eating: "most" babies do need to eat every 2 hrs during the day, some every hour. Her eating will become much more efficient in the weeks to come, I promise! Obviously if they are good nappers & sleepers at night, don't wake them! Unless of course directed by your ped because of weight gain concerns or something else. I just asked my ped as to when my son will be stretching his feedings & he said usually around 5 to 6 mths. But some babies stretch their feedings earlier, some later. Everyone's different!
One last suggestion: be talking with your ped & a lactation consultant regularly to get your concerns out there. YOU know your baby best & if you just don't feel right about something - say so! It's also good to have a log of her feeding & sleeping schedule so they can help you.
But don't read a book & then automatically assume something is "wrong" with your baby because she isn't falling into the norm that you just read or heard about. It can be frustrating - NO DOUBT. But my first son is now 3 yrs old & still only sleeps about 10 hrs a day, eats like crazy, poops every 3 to 4 days & is incredibly active. True to his newborn behavior in every way!!
Good luck - this time will quickly pass so treasure it! :)