We never used these The style prevents the child from swallowing air. Get rid of plastics in your life and move towards glass bottles. Plus three of them come with the additional silicone sleeves Dr. Brown’s glass bottles with silicone sleeves are highly sought after by parents for their durability and anti-colic features. Retail Price: Glass Dr. Brown’s bottles typically retail for about $10-$15 each. The silicone sleeves add extra value, costing about $5-$8 each. Tags: natural, anti-colic