(I am convinced we are going to change the human structure of the spine if we all continue to stay so hunchedover our phones or computers — but that is another topic and certainly job security for therapists haha).
If you're sitting up, having something to prop your feet up will help with your posture so you're not hunchingover to baby (I struggled with this, but my mom stayed on top of me about it the week she was with us).