When to start expressing?

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I'm just wondering when the best time is to start expressing some milk for storage so that hubby can feed her occasionally, especially if I am out for any reason?
I'm not in a desperate rush so want to time it well. She's been great with the BFing so far and we've had no problems with the latch etc.

 

[Katt]

I heard 3/4 weeks, but I don't see why you can't start building it into your routine now x