Hi Sir, For My twin baby babies who are 1 year 3weeks old babies we are giving both breast feed aswellas formula during night time. We are giving solid food during day time. They are still expecting formula milk(breastmilk not enough for both) during night time for every 3 hours on average) on average we are giving 3 to 4 times breastfeed(for every 2 to 3 hours) even after 1 year, if we don't give they cries a lot. After how many months they will sleep during night time without asking for feed for every 2 to 3 hours.