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