Some people are more anxious by nature than other people and I don’t know if you are one of them but I’ll just say this most of us check babies to see if they are breathing its pretty  normal so if you allow yourself to do it perhaps for a few weeks a few months you know maybe even for the first year off and on  don’t worry about it if that behaviour persists and it  bothers you, you know it doesn’t matter that it bothers other people but if it begins to bothers you, you might talk to a professional mental health counsellor just for some anxiety relief.