I think it could be PPA because of obsessing about something going wrong and SIDS. However, I’m not a professional. I have anxiety though. Its natural for you to not want to be away from your baby but obsessing about things going wrong isnt. To an extent, its normal but if you are asking about it, perhaps worth speaking to HV. Are you able to sleep when baby sleeps or are you worried something happening? Thats a big sign of PPA.
Sounds like PPA and think you'd benefit from seeking professional advice. I used to wake up at night alot to check on baby as I was worried about SIDS too. But during day was fine they said mild anxiety. So defo get it checked out especially if it's affecting daily.
Maybe it is just being a first time mum but personally I’d ask for some help, I hate the thought of my son being away from me no matter if it’s 5 minutes or 5 hours. I constantly worry about him and if he’s safe. When I was 3 months PP I was terrible and only let my son be with my mum for longer then an hour because I trusted her the most. Your going to worry about your child no matter what and your feelings are valid but if you feel like your struggling then reach out. There no shame in it at all, I did counselling for 6 weeks to help me and now it’s easier then it was but the fear is still there. My mum or BD( we aren’t together anymore and he spends the night with him whilst I work) will answer every message or FaceTime if I need it. They don’t care if it’s every 5 minutes or 5 hours. Keep going mama your doing amazing