without any worry. continuous use results in easy training to drink from a cup in just a few weeks. it is designed keeping baby's natural mouth cavity in mind, thus making for easy use. continuous use results in easy transition from soft spout to straw in just a few weeks. the unique non-spill function keeps the liquids inside the bottle even if the bottle is in a slanted or sleeping position. this also makes it ideal for travel and easy to carry in the bag. use under supervision. 