Erm, if the baby is jaundiced and needs treatment (often no particular treatment is needed apart from frequent BF and sunlight), then they can go into hospital for treatment? No more delay in treatment going from home than a ward (give or take a few minutes which are not crucial in a jaundice case).
DD1 was jaundiced and not feeding, the hospital midwives didn't even notice, and didn't pay any attention to me telling them she wasn't feeding properly (and because she was my 1st, I didn't have the confidence in my own judgement that I should have had) - it was the matron (modern equivalent anyway) who walked past the next morning and said 'that baby looks yellow to me'. Cue lots of sheepish midwives, and baby carted off to NICU (to be honest, there was lots more wrong with her as well that they hadn't picked up on, in fact, the whole experience was pretty awful). DD2 was my 'almost' home birth, we were back at home within hours of birth at the hospital and my (independent) midwife picked up on her yellow skin, but it was mild and she was alert (ish, for a newborn) and feeding voraciously, so we just kept an eye on her for a few days and it was fine, no treatment needed.
If you do plan for a homebirth, you will have to learn to fend off all sorts of 'but, what if..' questions from well meaning onlookers. That's where the research comes in, or a well rehearsed but polite 'its my choice, I've done the research, its just as safe, feck off' etc etc. To be fair, lots of people will be very supportive as well - its just that its an unusual choice (unfortunately), so its one that will attract lots of positive/negative comments. Its good practice for having every tiny parental choice you make scrutinised and judged for the rest of their childhood!