mine were each very different.
Taneli really needed a routine. he made one for himself and as long as we stuck to it, he was an angel

he was a baby who got very easily over stimulated and overtired, so to avoid those the routine was amazing.
at about 3 weeks we started to realise what he liked and found ways to ovoid over stimulation and overtiredness, and at about 8 weeks we organised his routine so it was on a more structured 2.5 hours awake time routine. he ate every 4 hours from birth (big baby), i only ever woke him in the day at nap 3, otherwise he was 'self regluating' and he slept through from about 6 weeks.
With Boo i thought 'wow' i've got this in the bag' and really tried to get him into a similar routine, but to no avail!!!!! 1. he was avery different nature, and 2 he didn't eat well, so everything was always a little pear shaped. by a few months old he was in a very vague routine, again dictated by him, but he just wasn't bother by things in the same way taneli was.
so basically i think the first month or 2 are for getting to know your baby and finding what sort of charactor they are and what sort of routine works for them.
i have recently read the baby whisperer and really like the vagueness of the routine with no times in, so perhaps thats an idea for next time