Should I CIO at this point? I was hoping he would improve over time, but he still wakes up every two hours to eat like clockwork (i.e. 10:30 pm, 12:30 pm, 2:30 pm, etc). I did CIO with DS1 and it worked so the temptation to do it again is strong. DS2 is 4 months and 3 weeks and weighs about 17 pounds.