I have been reliably informed that if LO is awake and playing in his cot, then I don't necessarily always have to go fish him out and entertain him. In fact it is good for him to have some alone time, to process all the info he sees/learns.
This comes from my parents who told me at 3 weeks to leave DS to cry because actually they have to have a good holler to open up all the alveoli in the lungs and to allow them to function properly 
So should I be playing with him all the time and not leaving him alone for 20 mins at a time say, or is this ok?!
DISCLAIMER - I am well aware that this is no doubt a ridiculous question and that this is propably bloomin obvious to a well-seasoned Mother. But I'm a relative newbie!