Quote:
Originally Posted by CherryBomb 
Strictly speaking, you can not depend on LAM if you're pumping and giving EBM, even for one day (or one bottle- even one bottle is a missed nursing session). The suckling at the breast is crucial for suppressing ovulation. Individual women may be able to give EBM occasionally without ovulation returning, but "the rules" don't allow it.
And yes, your body knows the difference between a pump and a baby.
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I'm with CherryBomb (as usual..love her!) on this one..I think LAM is incredibly reliable when followed well..and taking into account individuality of the nursing relationship, and the effect of that particular relationship on your own cycle.
For example, I was EBF our 2nd baby, and practicing LAM. He was bf'ed on demand, and we co-slept most of the night once he had his first night time feeding. When he was four months old, I proclaimed I was pregnant, and I was. What was the cause for the method failing for us? I would say, it was likely the slightly greater span of between feedings during the day and night, that occur even with an attached baby. It was just enough.
The same thing just happened to me last fall.

I was EBF our 6 month old, watching for my fertility signs and I had ZIP. I hadn't even slightly regained my usual ovulation CM increase that's generally my best indicator. I became pregnant...likely because my baby, who refused to nap away from me, was becoming more settled into long sleep periods at night due to being exhausted. That was all it took.
So, I would say it's important to always understand that LAM is very reliable when followed well, AND that because it's not hormonal or sterilization, "failure" occurs when the body and nursing relationship are in a place of just enough return to fertility! I would recommend fully sleeping with your baby, and having many comfort nursing periods during the day and night, in addition to nutrition, to absolutely prevent pregnancy..something I slacked off on when baby seemed less needy for it.