I.G.
My niece was born by c-section at 35 weeks, she was less than 5 lbs but in great health. She never went to the NICU and was exclusively breastfed (it just took her a long time, my sis pretty much nursed 24/7 for the first weeks). She was so tiny, my sister's boob was like twice the size of her head - it looked ridiculous.
My sis did stay in the hospital a bit longer than with her other kids, because L was so small, she could not regulate her body temp yet. However the hospital was a university clinic and implementing new reasearch all the time. Instead of keeping my niece in an isolette, they kept her in skin to skin contact with my sister to keep her warm. I am pretty sure that this helped her ability to breastfeed as well.
My own daughter was born at 37 weeks and nursed like a champ before we even clamped her cord...
Good luck!