There are videos on Dr. Jack Newman’s web site at
http://www.breastfeedingonline.com/newman.shtml
which show babies drinking. Look under the heading of Latching.
You should be able to see the baby drinking in bouts of large, slow jaw movements. If the baby is doing shallow, rapid movements, which only move her lips and not the jaw, the baby is comfort sucking.
Remember that comfort sucking is also useful for the baby and helps she develop emotionally. But if your baby is doing a lot of comfort sucking and you need/want to do something else then it is fine to cut down on the amount the baby does.
It is also helpful to have the support of a second non-lactation adult (usually the baby’s father) around. One problem breastfeeding mothers have is that they smell of milk. So whenever the baby is a little disturbed (like when you are putting them down in a cot) they wake up a bit, smell the milk and naturally want some more - just like we think of eating cookies when we smell them fresh from the oven.
If the baby is full and tired but not asleep give her to the non-lactating adult – who doesn’t smell of milk. Then the baby is much more likely to fall asleep (or play) with out asking for more milk.
Best wishes,
SARAH