Playtex® VentAire® NaturalShape® nipple design is closest to mom. This NaturalShape nipple features a raised, textured area - just like mom"s nipple. The design encourages proper latch-on, which helps promote switching between breast and bottle. Wide shape is designed for VentAire® Advanced Wide Bottles only. New medium flow nipple provides a perfect flow rate for your growing baby. Also available in slow flow (designed for newborns) and fast flow (for older babies).