Interpretation of “sleeping through” definitely varies!
One mum said her 7 month old baby was sleeping through. I then discovered that he was going to bed at 9pm, having dreamfeed at 11pm (and waking for it, so not really even a dream feed!), then getting up for the day at 5am. So that’s only 8hrs overnight, and only 6hrs of solid sleep.
Another mum said hers slept through, and again I found out that her 5 month old baby didn’t go to bed until 11pm.
Well my baby was going to bed at 7pm and not getting up until 6.30-7am, so around 12 hrs sleep. He was going around 8hrs before waking for a night feed - so if he’s been going to bed as late and getting up as early as the others, he too was capable of “sleeping through”.
It was comparing apples with oranges. So unless you know the other babies are going to bed for the same amount of the night, or if the mum counts a “dreamfeed” as a night feed or not etc, don’t try to compare it.
Oh and most of the mums who bragged their babies were sleeping through are now having trouble! So it doesn’t always last either!