The choice between Orthodontic and Rounded nipple for your Natursutten® pacifier is based on babys preference and is difficult to say beforehand. Some babies take what ever you give them, some are more choosy and needs to try both shapes in order to find the best match.
Both models are available with Original and Butterfly shield and in sizes S (0-6mth), M (6-12mth) and L (12 mth up)