I have question, my baby is 3 months old and doesn't sleep well (tried everything suggested, sleeps on good day in my baby carrier). Soon I can start sleep training. I have tried EASY for suitable her age, but as I never know if she sleeps this day then every day is different EASY. So my question, when S is failed an new EA is coming, do I start with new EA? Even if baby eventually haven't slept for a whole day? And how long to carry on PU/PD, if baby still doesnt sleep? I once tried for 5 hours and still no results.