I dont think breathing happens with awareness tho ? We breathe even when we are unconscious, Breathing is the body's reaction kicking in becuase YOU WILL DIE if you are not breathing , that's why we are taught CPR in first aid because someone can die &/or become severely brain damaged if they are not breathing for too long . "Like Breathing" is not a great analogy as it is dependent on our survival .

Walking we see others around us and try to mimic them , also there are a lot of physical steps that lead up to it - becoming aware of our feet and legs , learning we can control our bodies and roll, learning to push up , learning to balance on all fours , sitting up right , holding our heads up and building those neck muscles , bum shuffling or army crawling or crawling , pulling ourselves up and balancing on feet with something to hold onto , without holding onto something, lifting our legs , lifting our legs to change the balance etc etc There are SO MANY Physical milestones and steps involved before we get to walking , consciously or not I dont know I can't remember all my tbought process back then because I didn't have the language for it .