Sorry if this has been done before, I'm knackered so do forgive me!! 
We have DS2 who is 5 weeks old, he feeds generally every 3 hours but can go longer during the day when he seems to nap constantly. We've not set any routine for him yet as we have just followed DS1's bedtime routine: 7pm bath, story then bed. However DS2 will not settle alone in his moses basket, so we take him down stairs which after a feed he nods off til 11-12pm ish. We then struggle through the night as he tends to suffer from wind and does not settle after feeds unless we bring him into bed with us.
My question is, is this normal? Should we trying to deter him from co-sleeping (even though I find it really lovely waking up to those big brown eyes!!), and how old and when did people start with bedtime routines?