My eldest daughter, the first time I nursed her she latched on so perfectly that the doctor and nurse standing there were amazed. The next day the idiots in the observation nursery gave her a bottle, and there went my easy time. We spent the rest of the time I was in the hospital with both of us bawling every time I tried to feed her. It wasn't until I got home from the hospital and was easily able to discard all the crap I was told by the nurses to do (the pillows, etc) that thngs smoothed out, and even then it wasn't 100% smooth sailing. She used to kick the living crap out of me whenever I let down, and as her little feet were level with my incision site, this was excruciating.
Linda was born a month early, and was minute in comparison to my boob. She had the typical mild nursing problems of preemies. She was sleepy and had a lazy suck. For some reason we also had to swaddle her in order to get her to calm down enough to nurse--she wouldn't stay latched on otherwise; she'd just pop off and look around & get distracted. She also did the kicking thing.
Esther? Not one problem, not one issue. She latched on about five or ten minutes after birth and spent most of the next half hour attached to me.
She had a prodigious appetite even as a newborn, the only baby out of three to actually nurse 15 minutes straight on one side and then the other (for some reason, this is what they wanted to see from day one in the Navy hospital).
I answered others because, although I had issues, they were on the whole quite minor compared to what others have gone through. I had thrush, but never mastitis. I had latch problems, but never cracked nipples. (I did have a baby bite hard enough to draw blood, but I gritted my teeth and nursed anyway.)