How can I get my 12-week old to sleep soundly at night?

well first off i would get that pacifier in the bin, its a useless invention to plug a baby up, and give it a bad habbit it doesnt need. second, your baby should NOT be going this long without feeding, i have a 11 week old girl, she feeds, so she sleeps in bed between me and her daddy, and she wakes up 2 times in the night to feed, then falls straight back to sleep again. co-sleeping is very effective and healthy for young babies and as long as neither parents are drug users or smokers(they have deeper sleep), its very safe, and reduces the risks of SIDS.