There is a major growth spurt at 4 months and also a lot of developmental leaps at this time as well. LOs often wake 2x to feed.
What is your cat nap length? Without a CN, you LO goes almost 4 hours until bt, which would cause OT EWs.
At this age, I think I still had 2 feeds, since I didn't DF either. The first sleep stretch was the longest and and the one that lengthened over time. Then after that, my LO would wake 3-4 hours later again.