Features: - Designed for babies aged 6 to 18 months - Extra-large air holes allow skin to breathe and stay soft - Lightweight shield designed for maximum airflow - Safety pull ring, available in multiple colors and designs - Glow-in-the-dark button makes it easy to find at night - Silky smooth nipple for comfort and easy latch-on - Symmetrical nipple supports natural palate, teeth and gum development - Replace after 4 weeks of use for hygiene reasons