As an obstetric anaesthetist I can't think of a single baby reason why the section would be under GA (they're "worse" for baby)
Maternal reasons can be if mum has a bad heart condition, uncontrolled severe pre-eclampsia that was so bad their platelets were compromised (pretty rare), brain disorders meaning we can't do a spinal anaesthetic, spinal metal work (relative contraindication some will still do a spinal provided accept a metal work infection could be caterstrophic), rare bleeding disorders
From a ga perspective your birthing partner won't be allowed in but we will take you a ton of pics, bed is tilted to get bump off your tummy vessels, you'll be given an anti acid drink to minimise the risk. 3mins of oxygen which needs to be quite tightly on your face. They'll put the catheter in to drain your bladder before they start and put all the drapes and cleaning fluid on ur belly before we give the anaesthetic drugs, this is so there's the absolute minimum drug transfer to baby. Don't worry theyee not allowed to start till we give permission and you're totally asleep
The anaesthetic is cold as it goes up the arm, v normal..as you go to sleep our assistant presses on your neck to minimise regurgitation, most people won't remember that as its after we have started the drugs. We keep you asleep give you pain killers and antisickness before waking you up. Often have a sore throat for a few days, v small risk of damaging the lips or teeth with the tube.
All the drugs we give are breast feeding safe if you want to do so
GA sections are more painful to recover from so we often do nerve blocks to try to numb the abdo before you wake and you'll probably get a self administration click device to give yourself iv morphine