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baby bottle
A baby bottle is a bottle with a teat (also called a nipple in the US) to drink directly from. It is typically used by infants and young children when a mother does not breastfeed, or if someone cannot (as conveniently) drink from a cup, for feeding oneself or being fed.
In particular it is used to feed infant formula, expressed breast milk or pediatric electrolyte solution.
==Dimensions and design==
A large-sized bottle typically holds 280 ml; the small size 150 ml. It is composed of a bottle itself, a teat, a ring to seal the teat to the bottle, a cap to cover the teat and optionally a disposable liner.
The height-to-width ratio of bottles is high (relative to adult cups) because it is needed to ensure the contents flood the teat when used at normal angles; otherwise the baby will drink air. However, if the bottle is too tall, it easily tips. There are asymmetric bottles that ensure the contents flood the teat if the bottle is held at a certain direction.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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