silvermum - I don't agree that there is a different understanding of "sleeping through the night". There is a funny rationalisation of bad sleeping habits, one of which is "6 hours is night sleep, and look, baby sleeps 6 hours from 8 to 2 AM". This is wrong, as 6 hours is night sleep for adults but is only about half of what a baby needs to sleep in the night.
Growth spurt at 4 months? Funny things, these 'growth spurts'. I have read on MN that there are apparently well-known growth spurts at 1, 3, 6, and now 4 months. Can we then say that the whole early life of a baby is a growth spurt? Or that 'growth spurt' is a way to rationalise a baby's bad sleeping/feeding habits at any point in the first six months?
If you don't mind, I will continue to believe DD's paediatrician who said a 4 month old baby does not physically need to feed through the night and that nightfeeds at this point are a habit.
Good for you if nobody wakes during nightfeeds in your household. In ours, DH woke (light sleeper), I woke (not only to latch DD on, but to keep her there for a half hour, and then to put her back to sleep which took another half hour at times. And then I couldn't get back to sleep), and obviously DD woke. Not good.