Teaching babies the difference between day and night can be a bit of a challenge until their body clock kicks in. However it's something you can easily help them learn from just a few weeks old. Whilst its not possible to establish a routine when your baby is very young, there are things you can do to separate day and night activities. In the long run it will also mean you will both start to get more sleep.
Your child was born full of wonder. Everything seen, tasted, touched, smelled is a first time experience met with exploration. These experiences lay the foundation of brain development and learning. What gets emphasized as important in the first 5 years of life, actually shapes how the brain functions.