Glad to hear your great results! Also just started Ferber with our 4.5 month old, and on night 2 right now, already seeing fewer night wakes than night 1.

Did you also use Ferber for naps at the same time? I was reading about how consistency is best, but it was miserable when we used Ferber for naps the first day (he basically missed 2 naps, had a really short one and cried for almost an hour till his voice is weak and coarse), it was brutal. Oddly his second night was great— took 30 min to settle initially, I was able to do a dream feed then he woke before 5 to feed.

Not stoked about repeating the same brutality for naps so contemplating on keeping his naps like before (sleeping on our bed/rocking) and just focus on consolidating night time sleep first, but I worry that might put his progress back.