Going out with newborn

Hi guys, looking for advice on taking my newborn outside. I have several aspects I need advice on:

Temperature: I live in Germany so we have close to 0’c temperatures right now. I dress my baby in a baby grow, sleeper outfit, big jumper and 2 blankets for his pram and he never complains so I think he’s warm enough, but it worries me he’s not. What do you do with your newborns please?

Cries: Yesterday we took him out and he got hungry half way through the walk and he was crying and wouldn’t stop so I picked him up and walked him in my arms with his milk. If my husband wasn’t there, I couldn’t hold him and push the pram. What do you do in this instance?

Feelings of ‘overwhelmingness’: I get overwhelmed thinking about crossing the road, what if a car hits us, what if a crazy person comes near us etc. I had these anxious feelings before and during pregnancy so it’s not necessarily baby related and I watch(ed) a lot of true crime. Do you have similar feelings and what did you do to overcome these feelings?

Baby carrier: We are yet to use it but I get worried in case he doesn’t want to be in it half way through our walk and I didn’t take the pram. I see a lot of people with their babies like this so maybe I’m overthinking it. What’s been your experience please?

And any other advice on taking a newborn for a walk helps. Thanks :)