Hi my 5 week old baby wakes up to feed (breastfeeding) for 5 minutes then gose back to sleep it it normal? is she getting enough milk ?

The breast empties ~80% of its content in the first 5 min. That said, if the kid is growing/alert & playful during wake times and otherwise a good feeder I would not be concerned about quantity of feeds. Another issue may be she may have been taught to use the breast as a sleep aid. All infants wake at night, but retuning to sleep without a feed is helped if they are not fed as they fall asleep