DS only does it intermittently, and I would say it started around 3 weeks. He will be 5 weeks tomorrow and has only slept 4+ hours in one stretch 2 or 3 times.
He is pretty consistently sleeping for 3 hours stretches and going back to sleep immediately after finishing a bottle though, so that's something.
If my LO does not have gas she can go 4 hours or more easily. Started doing so around 5 weeks. But most of the time she has gas and wakes up every hour. Cant wait til her system has matured and I get my sleep back!
Re: sleeping at night
DS only does it intermittently, and I would say it started around 3 weeks. He will be 5 weeks tomorrow and has only slept 4+ hours in one stretch 2 or 3 times.
He is pretty consistently sleeping for 3 hours stretches and going back to sleep immediately after finishing a bottle though, so that's something.
Around 7 weeks