Baby refusing to sleep in his crib

Hey guys my wife and I could use a little advice. Our 5 month old is refusing to sleep in his crib, well let him fall asleep and put him in and he instantly wakes up. We do this 5 or 6 times and before you know it starts getting to 11 or 12. Weve been so tired and giving up and letting him sleep with us which is a habit we do not want to get into. We let him cry it out during the day for naps but we can't do that at night since it wakes up our 2 year old and turns into a bigger mess. He has a sleep sack he likes and we use a noise machine. He is being bottle fed every 4 to 5 hours still. Any advice would be greatly appreciated before I fall asleep at my desk! via /r/Parenting https://ift.tt/2Ys9ved