My LO is going on 4 months, so finally exiting the 4th trimester... I know there's some things we will ultimately need to change - mostly, he's not a great sleeper and we haven't really tried yet to install good sleep habits - but not sure when we need to start thinking about this stuff... So here's my questions, at what age (if ever) did you:

--Stop swaddling?
--Stop feeding on demand at night (or before a certain time at night)?
--Transition to crib?
--Sleep train?