I imagine that faced with your first newborn, one might logically assume that there would be periods where the child slept leaving some time for other activities. In reality, the only "hobby" the new parent will want to engage under those conditions is getting some sleep.
In my experience newborns sleep a lot. For a breastfeeding mother it's pretty exhausting and requires a lot more sleep. And the nights can be pretty broken, not as broken as they will be over the next few years in general though!
I imagine that faced with your first newborn, one might logically assume that there would be periods where the child slept leaving some time for other activities. In reality, the only "hobby" the new parent will want to engage under those conditions is getting some sleep.