How is 'through the night?" being defined? 5 hours, 8, 12? once in a while, every night, usually, etc? And what if the toddler wakes, but just to nurse and goes right back to sleep? Does any waking at all create a situation where the child is not "sttn"?
My 6 year old goes to bed at 8 and gets up at 6:30. 10.5 hours. He usually wakes at least once at night to use the toilet and have some water. Sometimes he likes me to come rub his back to get back to sleep, other times he goes back to bed all on his own. Is he sleeping through the night?
My 5 month old usually goes to sleep at around 8 and does not really wake on her own again until 6ish. That's 10 hours! Not in bed though, we keep her with us and hold her, not because we have to, but because we want to... (last baby!) But at 11ish when we go to bed we wake her up (and how) changing her diaper because we usually have to or risk a wetting overnight. And she nurses several times overnight-I do not keep count...maybe 3 or 4? She stirs, I nurse her, she settles. Is she sleeping through the night?
My oldest, now 9, had the shortest sleep stretches as a baby and a toddler. I really don't know when he started regularly sleeping more than 5 hours at a time, not until past his third birthday, several months after his little brother came, but he has never had sleep issues and is wonderful about bedtime and sleeping well all night and has been for years.