If you understand that the brain is interested foremost in survival, and that the brain has a deep need for relating to others, the things that best develop your baby's brain will make sense.
All kids need rules, but every brain is wired differently, so you need to know your kid's emotional landscapes inside and out -- and adapt your discipline strategies accordingly.
"Brain Rules for Baby: How to Raise a Smart and Happy Child from Zero to Five" is based on science that most parents (unless they subscribe to scientific journals) don't get a chance to see.