My baby is 4 months now and all of a sudden slept for 9 hours 3 daya in a row.. shall i leave her or wake her every 4 hours? she is breastfed only

Let babies sleep...: If she is happy and growing, just leave her alone. After 3 months of age, parents can give a feeding at 10 P.M. Or thereabouts, and expect the baby to sleep 6-7 hours. If a normal baby sleeps 9 hours and is fine the next day, she'll eat enough during the day to make up for sleeping all night (and parents will sleep well at night, too).