The Soft Bottle nipples are extremely soft and gentle for your baby to suckle and are available in different flow rates to suit babies from 0-18 months. Due to the unique valve, the nipples prevent the hard suckling needed with conventional bottles. The Different Types of Soft Bottle Nipples Level 1 - Slow Flow wide neck BornFree Nipple is recommended for babies 0-3 months. Level 2 - Medium Flow wide neck BornFree Nipples, recommended for babies of 3-6 months. Level 3 - Fast Flow wide neck BornFree Nipples, recommended for babies of 6 months plus. It also operates as a Medium Flow nipple with some thicker types of formula. Y cut - Wide neck BornFree™ Nipples, recommended for babies of 6 months plus. It Operates as a Fast Flow nipple for all types of liquids including thicker types of formula. Variable Flow - Wide neck BornFree Nipples, recommended for babies of 3 months plus and combines Level 1, 2 and 3 in one nipple. Tested And Proven! In a recent independent test, various leading brands of b