Its not necessarily about missing out the crying or not, its about hearing it sooner rather than later. You speak of "the baby". If you got two children, you don't want the youngest crying to wake up the oldest (or vice versa). You really don't want a toddler with a lack of sleep. Its causing temper tantrums extraordinaire. Thus far, I got lucky with ours. When she sleeps, she's gone in la-la land, her brother crying be damned. Or so it seems.