Most babies use bottles from birth until somewhere between 12 and 18 months old. The transition away from bottles ideally starts around 6 months, when you first introduce a cup, and wraps up by 18 months at the latest. Keeping bottles much beyond that window raises the risk of tooth decay, iron deficiency, and delays in oral development.
The Recommended Timeline
Around 6 months, you can start offering your baby a cup at mealtimes with whatever they’re already drinking, whether that’s breast milk or formula. This isn’t the moment you take the bottle away. It’s just the beginning of a gradual shift. Over the following months, you slowly reduce the number of daily bottle feedings while increasing cup use, with the goal of finishing the transition between 12 and 18 months.
Most babies are physically ready to start learning cup skills between 6 and 9 months. The key milestone is being able to sit up without support. Other signs your baby is ready include shortening their breastfeeding or bottle-feeding sessions, getting easily distracted during feeds, and wanting to hold the bottle themselves. These are all cues that your child is developmentally moving past the need for a bottle.
Why 18 Months Is the Cutoff
Prolonged bottle use creates several overlapping problems that compound the longer it continues.
The most well-known risk is tooth decay. When babies fall asleep with a bottle or use one as a comfort object throughout the day, their teeth sit in prolonged contact with sugary liquids, including milk and formula. This causes what dentists call baby bottle tooth decay, which most often hits the upper front teeth. The damage can be significant enough to require dental work on teeth that haven’t even been around for a year.
There’s also a nutritional concern that surprises many parents. Toddlers who keep using bottles tend to drink too much milk, which fills them up and crowds out solid foods. After 12 months, milk intake should be capped at about 16 ounces (2 cups) per day. Children who were still bottle-feeding between ages 2 and 4 had nearly three times the odds of developing iron deficiency anemia compared to those who had transitioned, likely because excess milk replaced iron-rich foods in their diet. About 12% of children with iron deficiency in one study were still using bottles well past the recommended age.
Bottle feeding in a flat, horizontal position also increases the risk of ear infections. Liquid can flow back through the tube connecting the throat to the middle ear, creating an environment where infections thrive. This is especially relevant for nighttime bottles, when babies are lying down.
Choosing the Right Cup
The type of cup you choose matters more than you might expect. Traditional hard-spout sippy cups are the most popular transitional option, but they aren’t ideal for oral development. The hard spout blocks the tongue from reaching the roof of the mouth, which prevents children from practicing the mature swallowing pattern they need for eating solid foods. Kids who rely heavily on sippy cups also tend to rest their tongue in a forward position, which can interfere with producing early consonant sounds like “M,” “P,” and “B.”
Straw cups are a better choice. Drinking from a straw strengthens the lip, tongue, and cheek muscles, encourages a more advanced swallowing pattern, and helps your child build the same muscle control they need for speech development. Sealing the lips around a straw is a fundamentally different motion than suckling from a bottle or sippy cup, and it moves your child’s oral skills forward rather than keeping them in the same pattern.
Open cups are the ultimate goal. They’re messy at first, but they teach the most mature drinking skills. Many parents use straw cups as the bridge between bottles and open cups, skipping the traditional sippy cup entirely.
How to Drop Bottles Gradually
The most effective approach is eliminating one bottle feeding at a time, starting with the ones your child seems least attached to. For most families, daytime bottles are easiest to drop first. Bring a cup to the table at meals and snacks, and let your child practice. Putting familiar liquids in the cup helps, since your child is more likely to accept a new container if the contents taste the same.
A useful intermediate step is switching bottles to plain water between meals while offering milk or formula in cups at mealtimes. This reduces the appeal of the bottle while keeping the cup associated with the “good stuff.”
The bedtime bottle is almost always the last to go and the hardest to give up, because it’s tied to your child’s sleep routine. If your child drinks for less than 5 minutes at night, you can stop that feed outright and use other soothing techniques to help them settle. If the nighttime bottle is a longer session, taper it down over about a week. Reduce the amount of milk by roughly an ounce every couple of nights. So if your child normally drinks 6 ounces, drop to 5 for two nights, then 4, and so on. Once you’re down to about 2 ounces, stop the bottle entirely.
Moving the bedtime feed earlier in the evening so it’s no longer the last thing before sleep also helps break the association between the bottle and falling asleep. The goal is separating the comfort of the bottle from the act of going to bed, so your child learns to drift off without it.
What If Your Child Resists
Some resistance is normal, especially around the bedtime bottle. Children form strong comfort associations with bottles, and the transition is emotional as much as practical. A few things that help: let your child pick out their own cup (novelty goes a long way at this age), offer lots of praise when they use it, and stay consistent once you’ve dropped a bottle feeding. Going back and forth tends to draw the process out and make it harder.
If your child is already past 18 months and still using bottles, don’t panic, but do start the weaning process. The health risks increase the longer bottles stick around, but they’re not a cliff. A deliberate two-week transition at 20 months is far better than continuing to delay because the timing doesn’t feel perfect.