| , page 48 Psychology Press 1994 : "stretch and yawn pattern at 10 weeks |
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| , page 48 2000 Cambridge University Press | In response to a touch on the sole of his foot |
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| , pages 10 and 128 2004 : "By the end of the 12th week, skeletal muscles begin involuntary movements | in Handbook of brain and behaviour in human development, Kalverboer and Gramsbergen eds |
| The newborn may cry and have muscular activity when cold, but there is no voluntary control of muscular activity | "Fetal movement counting for assessment of fetal wellbeing" |
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| Butterworth, George and Harris, Margaret | 415-418 2001 Kluwer Academic Publishers : "At 9-10 weeks postmenstrual age complex and generalized movements occur |