Your baby will begin to move during the late embryonic stage and will continue to move throughout it's development.
At first, the spinal cord will generate nerve impulses, causing flexing and contracting. Later, as the nervous system grows and matures the muscles will respond to stimuli.
Fetal movement in the beginning cannot be detected by the mother as it is mostly arching of spine and neck movement however, around the fifth month your baby can kick and curl it's toes, scratch or grab and flex it's joints and ribs. Usually around this time you might experience the “quickening” which is the kicking or punching a mother feels for the first time.
Many women around this time begin to take note of movements, their frequency and intensity and how many occur at one time. This information can be vital in order that both you and doctor can carefully monitor growth and progress. This type of report also helps when there is a problem as early diagnosis is vital in cases where movement is reduced or has stopped.