I've got 4 of these now and i love them
Although i'm not sure Lottie is aheavy wetter or not
All mine have the 6 layer insert topped with BV and seem to last her 3-4hrs at least (would probably last longer but i've not tried). I did buy one pre-loved which isn't as good but then i think its because it has microterry and minkee top on it (this one tends to leak after a couple of hours
I find the fit really good, just like the NL's and they look super cute too
You could borrow one of mine if you like and see how Jasmine gets on with them before you buy new??