The latter months are generally the most prevalent for these sensations. There are times when they will spontaneously move and kick about, and others when they just feel like relaxing, as we do. Movement is a pacifying activity for the baby in and out of the womb. Walking and moving about usually has a soothing effect. When your activity slows down, the baby increases its movement.
Activity can be in response to a meal.
Emotional activity, feeling anxious or excited can cause the baby to respond to the adrenaline produced. This is most prevalent during puberty, ovulation, through the menstrual cycle. During pregnancy the over active cervical glands are causing the condition. If there is not an odor or itching present, it is quite normal. As a very normal symptom of pregnancy, this situation can not be prevented.