It is completely normal for a baby's movements to be felt more prominently on one side during pregnancy. As your baby grows, they may find a comfortable position that allows them to move more freely in a specific area, such as the right lower side. This can vary from woman to woman and even from pregnancy to pregnancy. However, if you notice any sudden decrease in fetal movement or if you have any concerns about your baby's well-being, it is always best to consult with your healthcare provider for further evaluation and reassurance. They will be able to provide personalized advice based on your specific situation.