7972J Wide-Neck Baby Bottle, Soft Teat, Bottle lasts for 6 months, Teat lasts for 3 months. Size 6: 0-3 months, Size 8: 3-6 months, Size 10: 6 months and up. BPA FREE. Size 6: $2.8, Size 8: $3, Size 10: $3.2