FYI "cry it out" is a form of sleep training to be done on a ~5-6 month old infant.
Any baby younger than that you basically should always attend to their needs and never let them cry without trying to soothe them [there can be a grey area from 3-5 months but still the general idea is the same].
Any baby younger than that you basically should always attend to their needs and never let them cry without trying to soothe them [there can be a grey area from 3-5 months but still the general idea is the same].