Hi I'm new to the board and don't know much about BW as much as others do on this board, but I still thought I'd leave a comment!
In week 6, my LO was so fussy and wakeful during day/night asking for feed or to be held.
I've read that babies often go through growth spurt AND the wonder week at the same time in week 6.
So that's probably why they act more demanding than usual
as they are more hungry and overwhelmed by the new perspectives/development during that period.
So I wouldn't start the routine in week 6 (also that's what other books say), I'd suggest try it in week7?
My LO was back to good sleeper right after 6 week.
I think it's really 'one step back two steps forward' in regards to sleep matters (especially right after the growth spurt + wonder week).
HTH!!