Most babies should start transitioning away from bottles around 12 months and be completely bottle-free by 18 months. The American Academy of Pediatrics recommends offering a cup for the first time around 6 months, when solid foods are introduced, then gradually reducing bottle feedings over the following months.
Why 12 to 18 Months Is the Target
The 12-to-18-month window isn’t arbitrary. It aligns with a period of rapid development when toddlers are gaining the motor skills to handle cups and the cognitive ability to adapt to new routines. Starting the process at 6 months with occasional cup exposure gives your child months of practice before the bottle disappears entirely. By 18 months, most children can drink competently from a cup, and the longer bottles stick around beyond that point, the harder they are to give up and the greater the health risks become.
What Prolonged Bottle Use Does to Health
Keeping a bottle past 18 months isn’t just a habit issue. It creates a cascade of nutritional and developmental problems that can affect your child for years.
Iron Deficiency
The biggest concern is iron deficiency. Toddlers who continue bottle feeding tend to drink large volumes of cow’s milk, often well beyond the recommended 16 ounces per day for children 12 to 24 months old. All that milk displaces iron-rich foods from the diet. Cow’s milk also causes small amounts of gastrointestinal blood loss in young children, which further depletes iron stores. The combination of too much milk and too few iron-rich foods is one of the most common causes of anemia in toddlers.
Increased Obesity Risk
Bottles make it easy for toddlers to consume more calories than they need. A study of over 3,000 children ages 3 to 5 found that each additional month of bottle use predicted a 3% increase in the odds of being in a higher weight category. Among children 12 to 36 months, those still using bottles were significantly more likely to be above the 95th percentile for weight compared to children who had already weaned (19% vs. 0%). During this age range, children experience dynamic growth shifts, and excess calorie intake can push them into an overweight trajectory that tends to persist as they get older.
Ear Infections
Drinking from a bottle while lying down allows liquid to pool near the opening of the tubes that connect the throat to the middle ear. This creates a breeding ground for bacteria and is a well-documented risk factor for middle ear infections. The risk is highest in infants, but it continues as long as a child drinks from a bottle in a reclined position, which commonly happens at bedtime.
Tooth Decay
When a child falls asleep with a bottle of milk or juice, the sugary liquid bathes the teeth for hours. This is a leading cause of early childhood cavities, sometimes called “bottle mouth.” If your child does use a bottle or cup for comfort between meals, it should contain only water.
Signs Your Baby Is Ready for a Cup
Around 6 months, most babies show the early signs that cup drinking is possible. They can sit upright with support, bring objects to their mouth, and are beginning to eat solid foods. You don’t need to wait for a dramatic milestone. The AAP recommends simply offering a cup when solid foods start, treating it as a parallel skill that develops alongside eating.
Between 9 and 12 months, you’ll likely notice your child can hold a cup with both hands and tilt it toward their mouth, even if much of the liquid ends up on their shirt. That’s fine. The goal at this stage is familiarity, not proficiency. By 12 months, most children can take functional sips from a cup, which is the green light to start actively phasing out bottles.
Which Cup to Use
Parents often wonder whether sippy cups are helpful or harmful. According to the American Speech-Language-Hearing Association, there is no scientific evidence linking sippy cups to problems with oral or facial development. They’re a perfectly fine transitional tool. The real issue is when a sippy cup becomes the only cup a child ever uses, because then they aren’t building the skills needed for straws and open cups.
A practical approach is to offer variety. You might start with small sips from an open cup around 6 months, introduce a straw cup around 7 or 8 months (squeezable ones help the child see where the liquid comes from), and use a sippy cup for convenience when you’re out of the house. Straw drinking is more developmentally advanced than sipping from a spout and closer to how adults drink, so it’s worth introducing early. The key is moderation across cup types rather than relying on any single one.
How to Wean Off Bottles Step by Step
The most effective strategy is gradual elimination, starting with daytime bottles and saving the bedtime bottle for last. That bedtime bottle is deeply tied to your child’s sleep routine, and it will be the hardest to drop. Tackling the easier ones first builds momentum.
Begin by picking one daytime bottle feeding and replacing it with milk in a cup, served at a meal. Do this for a few days until your child adjusts, then eliminate the next daytime bottle. The goal is to teach your child that milk comes with meals and isn’t something they carry around. Within a week or two, you can typically reduce bottle use to just the bedtime feeding.
For the bedtime bottle, you have a few options. Some parents gradually reduce the amount of milk in the bottle by an ounce every few nights until it’s empty, then remove it. Others swap in a cup of milk as part of a new bedtime routine that includes a book or song. The transition goes more smoothly when you replace the bottle with something comforting rather than simply taking it away. Some families have success with a “Bottle Fairy” story, where the child gives their bottles to “babies who need them” and receives a new cup in return.
Expect some resistance, particularly around bedtime. A few rough nights are normal. Most toddlers adjust within a week once the bottle is fully gone. If your child has a chronic illness, physical differences, or motor skill delays, it’s reasonable to work with your pediatrician on a timeline that matches your child’s individual abilities.
How Much Milk After the Bottle Is Gone
Once your child transitions to a cup, it’s important to keep milk intake in check. For children 12 to 24 months, the recommended amount is about 16 ounces (2 cups) of whole milk per day. For children 2 to 5, the range is 16 to 24 ounces of low-fat or skim milk daily. Going beyond these amounts increases the risk of iron deficiency and can crowd out other nutritious foods. Serving milk only at meals, rather than letting your child sip throughout the day, naturally keeps intake within a healthy range.