I breastfed my 1st DS from day one, he fed for 6 weeks completely on Breastmilk with no formula at all.
I got mastitas 3 times and gave up feeding him at 6 weeks due to the pain and his constant hourly feeds, it was draining me.
I then said i felt like a failure for it, and that if i had anymore children i would feed them for at least 6months to a year.
When i fell pregnant with DS2 i was adamant Breastfeeding was for me, so much so that i did not buy any bottles at all.
After i had DS2 he didnt have his first feed for 2 hours due to the damage to my area, it took the midwife an hour to stitch me up. He finally got a feed 2 hours after been born and wasn't latching on properly.
Until i went home i tried my hardest to get him to latch on and suckle from me. It was no good and i was already a failure, he wouldn't latch on and he had to have a replacement forumla to replace low sugars (or something similar - i forget now, as i was still out of it from the drugs)
Now that was 2 years ago and he was a sicky baby, had reflux and didn't wean until he was 10 months old.
My oldest son who was breastfed eats anything and everything but catches EVERY illness going.
My youngest son who wasn't breastfed has NEVER been ill.
Sooo, as for the benefits of Breastfeeding - what is it meant to be, because i do not find it has helped my sons immune system at all!