There are so many logs you can keep to make sure all is being done correctly.
Bottles/how many oz
Breastfeeding- how often on each side
Mom's diet- to reach weight loss goals or see how foods react to infant
I have a mental log on how much sleep I am getting at night. Two nights ago I got 2 solid hours and a few 20 minute chunks. That nearly broke me. Last night I went to bed at 1130 got up at 230, then 4 and was wide awake till 5, woke up at 6 then up at 8. Three years ago this would of broken me but today I feel refreshed! Yawn ;-)