Everyone has different opinions.. but I believe "sleep training" isn't appropriate until a year... at the earliest 6 months.
During those first 6 months, I believe that alot of waking is really survival techniques... they need to eat, they need to be changed, etc.
I have a bit of an extreme view, but I'm sure you'll see everything on here.
With my dd, now 28 months, we would "put" her to sleep, then transition to laying her down... rock her.. then hold her still for a couple minutes, then lay her down gently, hold our hands on her... she did sleep alot in her swing for naps, etc. when she was younger. it is very tough once they get past that newborn sleep all the time stage.
Do what feels best to you as ds' mommy.
HTH