The good news is yes it does end - even if it takes a while. The 4 month wonder week is an absolute doozy, DS's sleep went to absolute pot going from 1-2 wakeups to 5-6 wakeups (I don't know how far apart as I refuse to have a clock in the bedroom) per night as well as being as fussy as all heck throughout the day and catnapping if that. He's now a week or so shy of 6 months and is back to sleeping fairly well, usually only one feed overnight at around 2-3am and nice long day sleeps as well.

Hang in there it does get better!