@QuestioningThings1 I know exactly the kind of anxiety you are feeling.
When DD1 was born, I went a bit OTT in regards to being over-protective. I think it was caused by her being born by ECS then being taken to SCBU for a few hours, whilst I had to stay on the post-natal ward with mums and their newborns, without her.
I was also a second time parent (DS was 18.5 years at the time, I was OK when he was a baby).
I do have a history of anxiety and bipolar, so that made things worse.
With her I worried about everything. I was worried about her getting sunburnt, about going out with her in her pram in case a car mounted the pavement and hit us, about a swarm of bees attacking her.
I breastfed and would express milk to mix with baby porridge when she began weaning. I would regularly throw the porridge away as I would worry that I may have opened a kitchen cupboard and a paracetamol may have fallen out and into it. It sounds ridiculous now - but it was a real fear.
She was a baby that put EVERYTHING in her mouth, so I used to phone the HV to ask if she would be OK after mouthing toys at the health clinic. I think the HV may have been worried about me.
I can understand the worrying about their faces being close, but the only real worry about that would be if they had cold sores - HSV1 (and 2), can be dangerous to very young babies.
My dad adored DD1, really, really adored her. He smoked but would put his face next to her (never straight after a ciggie though).
Some germs are good for babies, they cannot build up immunity without exposure, so it's good for her to be exposed to some germs.
You feel how you feel though. It will get better, the anxiety will ease, but you're still the most important person to your DD and that bond is at it's strongest right now, so the protective instincts are very high...she will be fine though x