This is all well within normal, MrsMB. Babies do quite a bit of stop-start learning about breastfeeding in the early days....my guess is your supply has increased and she is struggling a little at the moment to cope with the fast flow. She will get better at it
It reallydoesnotmatter a bit that she takes 10 mins at a time - you can't judge volume of milk taken by looking at the time on the clock. In healthy, thriving term babies, you don't need to do anything but follow the baby's lead. Don't be tempted to be anxious about it.
You can ask the midwife for a visit or at least a telephone call if you want to talk more about it. She will take into account your baby's weight and feeding frequency, and she will almost certainly say all is well.
Babies of this age usually produce several soft yellow poos a day, too, and this along with wet nappies is also a good sign