shouldnt my DD be sleeping thru by now? shes 6 months old in 2 weeks.

i put her to bed at 7pm, dreamfeed at 9pm, she sleeps til between 4 and 5am, feeds, then back down til about 630am. she is FF.

im probably gonna be barraged by mums saying "my 6m.o only sleeps 3 hr blocks" but alot of my friends who have FF babies similar age to my DD say thier babies sleep 10-12 hrs overnite (as in without a feed), DD struggles to go 7-8 hrs.

im not whinging, just wondering why?? shes started solids but it doesnt seem to have made any difference at all...