This Nuby Flip It beaker is perfect for little ones. The cup features a soft silicone straw which is gentle to tender gums and emerging teeth. The straw is covered by an easy -to-use flip cap, which protects the straw from contamination when not in use. Liquids only pass through the straw when your child sips, making it leak resistant. Warning:Allowing your child to use this product for prolonged periods separate from regular mealtimes or to go to sleep while drinking liquids, other than water, from this sippy cup may cause or contribute to early childhood tooth decay. Straws are not suitable for children under 6 months.