I would fear OT at the end of the day as that final A time can be quite long really - but if it is working for him then it is working for him
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So I would say continue as you are and see if it continues to work
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We essentially just use 'averages' to help with routines and of course not all babies want to do the same as all the others - I think body clock has a lot to do with it really.
But following a babies cues is the essense of BW, and also if it isn't broken, don't fix it
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