No, Pigeon Peristaltic Nipple bottles come with different nipple sizes. The bottles feature various nipple hole types and flow rates designed to match a baby’s age and feeding ability, ranging from a small round hole for newborns to a Y-cut for babies 12 months and older. Choosing the correct nipple size helps ensure the baby feeds comfortably and finishes within the recommended 10-15 minutes. Always check the age and flow guidance on the packaging before use.