It depends on your opinion what STTN is. If in your opinion it is 5-6 hours then my girls have been since they were 6-7 weeks. For awhile now they have been sleeping 8 hours straight at night.
They have been sleeping for about 10 hours for a month now. So it was around 3 months...when they hit over 10 pounds, that they started sleeping for a good long stretch. I think around 8 weeks they started doing 5 hours.
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Griffin STTN at 8w - we followed Baby Wise...
We're doing BW with the twins, too, and last night they both STTN for the first time - from approx 10:30pm to 5:30am... I hope they keep it up!
Baby Wise is my saving grace! Everyone I know who has done it has babies that STTN around 8-12w.