There's no way of knowing. My little one arrived at 35+1 weeks and spent 2 weeks in the NICU as he needed help with his breathing. Doesn't mean all babies are the same though..
If you’re having a section anyways why is baby coming out so early. Size would only be a factor for natural birth. Size doesn’t affect sections. I’d be questioning that
@Bex I believe the reasoning is that they're worried about late term still birth. Especially as my Blood Sugars had not been stable (they weren't able to get me a pump until recently which has now improved that) and the baby is already measuring over 7lbs/3.2kg at my 32 week scan so they're also worried she'll "outgrow" what the placenta can give if we wait too long.
@Charley I appreciate the responses here. Clearly having a first time parent panic moment over all of this. All I can do is be hopeful that she copes well. And if she doesn't, well I'll be in the right place for help
Some 35 weekers are fine and don't need additional support. Some 40 weekers have problems and need additional support. There's no way of knowing for certain, it's likely she may need a bit of extra help as it's not just weight its how developmentally ready they are. This could just be some oxygen for a few minutes at birth rather than a transfer to NICU. Try not to worry about it too much and trust that they'll look after you both and only separate you if absolutely needed