1 to 6 months: Infants have two emotions: undifferentiated excitement associated with tension or need and undifferentiated relaxed quiescence {emotion development, 1 to 6 months}. Fear is undifferentiated reaction to strange, unexpected, or dangerous stimuli.
From one to six months after birth, idealized human faces and/or voices cause smiles {smiling response development}.
4-Zoology-Development-Stages-Infant 01.0-06.0 Months
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Date Modified: 2022.0225