Month 0

During fetal life child becomes accustomed to the melody, stress, and timing of the mother’s speech patterns⁸⁶

Distinguishes mother’s voice^{91, 92}

Experiences satisfaction and displeasure¹⁵

Interactive behaviors used to get attention of others⁸⁷

Entrainment – linked behavioral exchange between infant and mother. Infant movements related to maternal speech occurs within hours of birth⁸⁹

Can imitate common movements already within behavioral repertoire (e.g., tongue thrusting and mouth opening)⁹⁰

Quiets when picked up¹⁴