Quick Answer
The American Academy of Pediatrics (AAP) recommends transitioning away from the bottle and toward an open or sippy cup by 12 to 18 months of age. Beginning the introduction of a cup at around 6 months (alongside the introduction of solid foods) makes the eventual full transition significantly easier, as the baby has time to become familiar with cup drinking well before the bottle needs to be removed. This guide covers the developmental and dental reasons behind the timing recommendation, how to introduce a cup early, and practical strategies for making the full transition when the time comes.
Why Timing Matters
Dental Development
Prolonged bottle use beyond 12 to 18 months is associated with early childhood tooth decay, sometimes called baby bottle tooth decay or nursing caries. When a baby or toddler sips frequently from a bottle (particularly one containing milk or juice), the liquid pools around the front teeth and creates an environment that promotes bacterial growth and enamel erosion. The risk is highest when bottles are used for sleep (nap or bedtime) or carried around throughout the day as a comfort object, both of which involve prolonged, frequent exposure of the teeth to milk sugars. Water in a bottle does not carry the same risk.
Cup drinking changes the mechanics of liquid delivery: liquid from a cup is swallowed more quickly and does not pool around the teeth in the same way. Transitioning to a cup for milk feeds reduces the duration and frequency of tooth surface exposure to milk sugars.
Oral Motor Development
The sucking pattern used for bottle feeding (a backward-pressing tongue movement that differs from mature swallowing) is appropriate for infants but becomes less beneficial as a toddler's oral motor system matures. Prolonged bottle use beyond 18 months can interfere with the development of the more mature tongue and swallowing patterns needed for speech and solid food management. Cup drinking supports the forward tongue movement and mature swallowing pattern that underpins clear speech development.
Iron Absorption and Appetite
Toddlers who continue to take large volumes of milk from a bottle beyond 12 months often take in more milk than is recommended for their age (the general guidance is around 350 to 500ml of whole cow's milk per day for toddlers), which can displace solid food intake and contribute to iron-deficiency anaemia. Transitioning to a cup tends to naturally moderate milk intake as drinking from a cup is slightly less efficient and less comforting than the bottle, which helps the toddler's diet balance shift toward solid foods as the primary nutritional source.
When to Start: Introducing a Cup at 6 Months
The transition away from the bottle is significantly easier if a cup is introduced early, at around 6 months, as part of starting solid foods. At this stage the goal is not to replace bottle feeds with cup feeds but simply to familiarise the baby with the cup as an object and a drinking vessel. A few sips of water from an open cup or a soft-spouted trainer cup at mealtimes is sufficient. Babies introduced to cups early adapt to them as a normal part of their feeding experience and are less likely to strongly resist the eventual full transition.
If your baby has never encountered a cup before 12 months, the transition is still achievable, but it may take more time and patience as the cup is entirely novel and the bottle is deeply established as a comfort and feeding tool.
Types of Cups and Which to Use
Open Cups
Open cups without a lid are the most developmentally appropriate drinking vessel for babies and toddlers and are the cup type recommended by many pediatric dentists and speech pathologists. They support mature swallowing patterns and do not require any sucking action. They are messier, particularly in the early weeks of use, but that mess is part of learning. Small, weighted open cups designed for babies (which are harder to tip) make the learning process more manageable. Most babies can begin to drink from an open cup with assistance from around 6 months and manage it independently by around 12 to 18 months with practice.
Soft Spouted Trainer Cups
Soft spouted trainer cups (with a flexible silicone or rubber spout) are a common first step and are familiar to most families. They are spill-resistant, which makes them practical for everyday use. The sucking action required for a soft spout is similar to but slightly different from bottle feeding, and they are generally easy for babies to learn. They are a reasonable transitional step, though pediatric dentists note that cups with hard spouts or valve systems that require significant suction (similar to a bottle) carry some of the same tooth surface exposure risks as bottles if used for milk throughout the day.
360-Degree (Rim-Drinking) Cups
360-degree cups allow the child to drink from any point on the rim, mimicking open cup drinking while remaining spill-resistant. They are considered a good middle ground between the open cup and the spill-proof trainer cup, supporting more mature drinking mechanics than a spouted cup while remaining practical for daily use.
Straw Cups
Straw cups support a different but also mature oral motor pattern (drawing liquid up through a straw requires a different tongue and lip position from bottle sucking) and are a reasonable alternative to the open cup for the transition. Most children can learn to use a straw by 9 to 12 months with practice. Straw cups are spill-resistant, practical for travel, and do not carry the same dental concerns as spouted cups used for milk.
How to Make the Full Transition at 12 to 18 Months
For most families the full transition from bottle to cup works best as a gradual process rather than a sudden removal of all bottles. A common and effective approach:
- Start with the easiest bottle to drop first: The midday bottle is typically the one with the least emotional significance and is the easiest to replace with a cup of milk alongside a meal. Replace this bottle with a cup for 1 to 2 weeks before moving to the next
- Replace bottles one at a time: After the midday bottle, move to the morning bottle, then the afternoon, leaving the bedtime bottle last as it carries the most comfort significance
- Offer the cup as a normal part of meals: Serve milk or water in a cup at every meal and snack from around 12 months so the cup is associated with nourishment and routine, not just as a substitute for the bottle
- Change the bedtime routine rather than just the vessel: The bedtime bottle is hard to drop partly because it is embedded in the wind-down routine. Replacing the bottle with a cup of milk earlier in the routine (before teeth brushing rather than after, as milk should not remain on teeth overnight) and adding another comforting element (an extra story, a cuddle, a familiar toy) makes the transition easier than simply substituting the vessel at the same point in the routine
- Avoid cold turkey removal unless necessary: For most toddlers, gradual removal is less distressing than suddenly having all bottles gone. However, some families find that a clean break works better for their child's temperament, particularly if gradual reduction has stalled
- Acknowledge the feeling without reintroducing the bottle: It is normal for toddlers to protest the removal of the bottle. Acknowledge their feelings, maintain the boundary, and offer comfort through other means. Reintroducing the bottle after removal resets the process and makes the next attempt harder
When the Transition Is Taking Longer Than Expected
If a toddler is strongly resisting the cup transition beyond 18 months, or if cup drinking is significantly affecting their milk intake or sleep, speak to your pediatrician. Some children take longer to transition due to oral motor sensitivities, strong temperament-based attachment to the bottle, or feeding history factors. A speech pathologist or feeding therapist can provide targeted support for toddlers with oral motor or sensory-based cup refusal.
Key Takeaway
Begin introducing a cup alongside solid foods at 6 months so the cup is familiar well before the bottle needs to go. Aim to complete the full transition by 12 to 18 months in line with AAP guidance, primarily to protect developing teeth and support mature oral motor development. Use an open cup, 360-degree cup, or straw cup in preference to hard-spouted cups for milk feeds. Replace bottles one at a time, starting with the midday bottle and leaving the bedtime bottle last. Change the bedtime routine rather than just the vessel. Seek pediatrician or feeding therapist support if the transition remains stuck beyond 18 months.
Parents Also Ask
How to Introduce Solid Foods Without Stress
How to Build a Feeding Routine That Works for Your Family
Glass vs. Plastic Baby Bottles: Which Is Safer?
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your pediatrician with questions about your child's feeding development and transition milestones.