DD1 (born 36+1 so a hint premature) was 10 days old when we had to rush back to hospital with her floppy and unresponsive. Her jaundice was off the scale (as in into the writing at the top of the chart - I'm a nurse so I know how far off expected THAT means).
They investigated all sorts, initially wondering if she had meningitis, doing lumber puncture etc and starting her on hideous antibiotics. They decided it was 'just' jaundice that resolved almost overnight with +++ UV treatment we called her alien glow baby
She was in for 2 nights, and all the staff reassured me that it was just one of those things and there was nothing we could have done (they changed the protocol between her and DD2 and they didn't leave a 'slightly' yellow baby for days without testing levels).
On the morning I was due to leave to go home a new paed nurse came on duty and immediately started questioning what I'd done to nearly kill my baby. I gave some very firm answers - No I had BF her fine. I'd seen the BF advisor twice, including the day before admission, plus she'd wee'd like a horse on arrival at hospital - not underfed or dehydrated. No my house was perfectly warm (she was hypothermic on admission as part of the floppy thing). No I hadn't neglected my child in ANY way.
When the Doctor came to do the discharge she asked him pointedly if I was ready to be discharged with the baby, and maybe I needed support (hinting at SS involvement). I've worked in hospitals for years and I have never seen such a withering look than the one the doctor gave that nurse. She was HATED.
But if I hadn't been a nurse, if I didn't know bitch-nurses from the past, if I hadn't seen the BF advisor, If I didn't have rock-solid self confidence - she could have crushed me with that comment and made me thought I'd harmed my baby. As it was I had PND but had I felt guilt for this it would have been so much worse.