R is 10 months and doesn't STTN ever. He eats solids well and drinks breastmilk. After 2 weeks of Ferber checks that worked, he never gave up the waking, then got sick and the checks stopped working after that. So I am considering straight CIO now (he can put himself to sleep). I have let him cry 15 mins motn (and have gone over an hour with Ferber checks). So I'm curious, if you did CIO to eliminate a single night waking, how long did the baby cry?