Re: 3 week old sleepong through the night?!
Mine NB's start at 8 hours and by about 6 weeks are doing 12 - 15 hours. I was absolutely petrified. It really makes breastfeeding a struggle!
My Dr was quite matter of fact, if they are happy, healthy, putting on weight, peeing and pooping, thank your lucky starts and don't tell anyone. Sleepless nights seem to be a badge of honor?!?