my DD was born 12 days overdue with no apparent signs of poor health. Within 15 hours of birth (ie the morning after she was born) the midwives picked up that she had a blockage in her bowel and was moved straight into the SCBU. She had to be transferred that night to another hospital and was operated on at 3 days old.
Once she was in the SCBU (at both birth hospital and surgery hopsital) she was put on a heated cot so just lay in a nappy and had a tube down her nose, heart monitors on her chest and cannulas in both hands. Pre op the nurses let me hold her briefly but we were pretty much retstricted to just touching and stroking.
Post op she was on a morphine drip and had to be on a ventilator for a few days as the morphine can make babies 'forget' to breathe as we were told. I don't think I got to hold her again til she was about 6 days old and then I had to be careful with all the wires and tubes connected to her
If your baby is going to be in SCBU for a long time I would suggest buying some good handcream! You will find yourself washing your hands so many times that they will probably get quite raw.
If you are planning on breastfeeding, see if the hospital has a breast pump you could borrow. Failing that make sure you get hold of one as soon as you can as it would make sense to start expressing as early after the birth as you can. Most SCBU have 'expressing rooms' where you can use their pumps with sterile bottles etc but don't get despondent if in the early days you only manage to fill a few mils of milk whilst others seem to produce gallons! Most SCBU babies we saw were fed via a tube through their nose every 3 hours which is why the milk either needs to be expressed breast milk or formula. Whilst I was at the hospital every morning and evening, there were often days when I only got to actually breastfeed my dd once or twice.
Some of the emotional downsides I found were having ante natal friends who all had their babies at home and were swapping birth stories and other experiences. Because my dd's problems had not been anticipated I pretty much got pushed into the background once they were picked up. We were also in hopsital over a particularly gorgeous Easter and it was hard listening to all teh stories of my friends going for walks in the park etc with their LO - ie all teh things I'd been dreaming of doing with my own for the previous few months
In their wisdom the medical teams decided that it was best to transfer my post natal care to the new hospital as they thought I would be there most of teh time. Only trouble was, my dd's surgey was on day 3 (baby blues day) and i had to go to the maternity ward to be seen by someone. There was no one free at teh time of my appointment and i was asked to sit in a corridor and wait. Needless to say sitting listening to new born babies crying and seeing proud dads arriving with car seats to take their LO's home when I hadn't even held my dd for 48 hours left me howling in bits, so just watch out for unexpected hormones.
Umm think I'd better stop now but if there's anything more specific you wanted to know, just ask