According to Esther Thelen, true walking develops because of a genetic plan and a change in the ratio of ________ to ________ in infants' bodies
Fill in the blanks with correct word
muscle strength; weight
Psychology
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Though a memory for routines appears very early on, ______ memory, or memory on demand, is probably impossible in the first few months of life
Fill in the blank with correct word
Psychology
Baby talk and motherese are accurately referred to as ______ by scientists
Fill in the blank with correct word
Psychology