My baby girl is 4 months old breastfed,

she sleeps well and might get up once or twice at night but she won’t really eat much it’s like when she starts crying in the middle of the night I feed her laying down ( she co sleeps) she just latches on for a minute maybe or less and falls asleep.

When I change her diaper the next morning it isn’t full and heavy like the rest of the times where it’s very heavy.

So what I’m guessing is she doesn’t eat a lot at night, I’m worried if it’s okay for her.