1 minute to 2 months--How do you spell Major Nuisance? U-n-d-i-f-f-e-r-e-n-t-i-a-t-e-d c-r-y-i-n-g.

NOTES: Here are some interesting samples of baby's crying.

NOTES: Here are some more samples of baby's crying. It's worth downloading to remind you of the scientific rigor of this class.

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