Letdown decreases in the evening

Belle

When my son is cluster feeding, by the time its around 5pm to 6pm he gets fussy during feeding. I believe its cause my letdown as slowed up. He then falls asleep and is up in 30 to 45 mins for a feeding session again. Should i give him my milk from the bottle around this or should i keep putting him on my breast until hes done cluster feeding??? Its hard to look at him stress over trying to get a letdown going.

S/N

I know that babies cluster feed to tell mommys body to produce more milk.

And ive been drinking water all day to keep my supply up.