wondered what you'd decided vis-a-vis weaning. saw your posts and i'm in a similar situation -ds will be 19 weeks tomorrow and his sleeping/feeding has been all over the place for the last 10 days or so. he was going from 7pm to at least 3:30 or 4am (even managed 6am once) but now wakes up for feeds at least twice a night (yawn) - e.g. last night down at 7pm, awake at 1:00, 3:30 and 6:00. wouldn't settle without a feed.
worryingly, he feeds really well at night but is increasingly fussy during the day, and i'm worried that he's developed a pattern of catching up on calories at night.
i'd rather wait (for all the reasons listed on threads below) but wonder how long i can wait for this 'blip' to pass - if indeed it is a blip.