is it enuff?? 3m2wk bb

My baby usually drinks at this schedule 7-8am : latch on until sleep 12-2pm : latch on 5pm : 140ml ebm 7-8pm : 140ml ebm OR 150ml formula 11pm-12am : 150ml formula then she will wake up next day to latch on again. she is still active, dont rly know how to see if baby is dehydrated or not gaining weight.. but so far she seems ok n good. sometimes bb dont even finish 150ml of formula or 140ml of ebm will left maybe 5-20ml depending. is this normal for a 3m old baby?? coming to 4 month?? wet diapers about 5/6times and dirty about 2times averagely..