yep i wouldnt think it is anything to worry about - the red cheeks can be a sign of teething (and also my DS gets them when he is sick with a temp etc) but also when they are young it cab be irritation from drool etc.
also if he has been out in the wind they couldbe a little wind burnt - but if not bothering him i wouldnt worry. you could moisturise them if they feel a bif rough or sore (i use jurlique cream which is fab)