Help getting infant twins to sleep?

My twin infants are 2 weeks old. They are currently together in one crib. They bottle feed every 3 1/2 hours round the clock, 3 oz (90ml). During the day, they wake, get changed, feed, fall asleep, then are put down easily. However, at night, starting at the 8pm feeding, they follow that same wake, change, feed, sleep pattern but when put down wake up and cry. When picked up, they calm with gentle rocking or being offered a breat (even though I am not feeding). Pacifiers are promply spit out. After that, they will not let me put them back down. happy to be put down. They do this until about the 5am feeding, where they are happy to be put down. This is keeping me awake all night and I am at the end of sanity. I sleep during the day when they sleep, but also have a five year old son to attend to. Please help. If you have experince with infants or this happened to you, I would like advice.