You can introduce a cup to your breastfed baby around 6 months of age, right when solid foods typically begin. The American Academy of Pediatrics recommends offering a cup at this stage, even if your baby has never used a bottle. For breastfed babies specifically, a cup can be a natural next step that skips bottles entirely and avoids any risk of nipple confusion.
Why 6 Months Is the Sweet Spot
At 6 months, most babies hit a cluster of developmental milestones that make cup drinking possible. They can sit up without support, hold objects steadily in both hands, and bring things to their mouth with reasonable coordination. These are the same skills needed to handle a small cup with help from a parent.
The goal at this age isn’t to replace breastfeeding. It’s to let your baby practice a new skill during mealtimes while continuing to nurse as usual. Think of it as exposure, not transition. Your baby will take tiny sips of water or expressed breast milk, and most of it will dribble down their chin. That’s completely normal and part of the learning process.
What to Put in the Cup
Between 6 and 12 months, the CDC recommends limiting water to 4 to 8 ounces per day. Breast milk should still be your baby’s primary source of nutrition and hydration, so the cup is really just for practice sips alongside solid foods. You can fill it with a small amount of water or expressed breast milk.
Skip juice entirely. The AAP says juice has no nutritional value for children under 1 and they shouldn’t consume it at all. Sugary drinks also raise the risk of cavities, especially when sipped between meals. If your baby is thirsty between nursing sessions, water is the only thing that should go in the cup.
Why Speech Therapists Say Skip the Spouted Sippy
The traditional hard-spouted sippy cup is what most parents picture, but it’s not the best choice for oral development. The American Speech-Language-Hearing Association warns that a hard spout sits over the front third of the tongue, preventing the tongue from lifting to the roof of the mouth. That upward motion is essential for learning to chew food effectively and, later, for clear speech. When toddlers keep using that infant suckling pattern, eating new textures becomes harder and messier, and a tongue that can’t elevate tends to rest low and forward in the mouth, which can interfere with language development.
Better options include straw cups and small open cups. A straw encourages a more mature swallowing pattern. Once your child gets the hang of straw drinking, you can trim the straw shorter so the tip barely reaches the tongue when their mouth closes around it. This keeps the tongue free to elevate properly. Open cups are even simpler: they promote the same natural drinking motion adults use, and practicing with a tiny open cup at mealtimes builds coordination quickly.
If you do use a spouted sippy cup, treat it as a short-term training tool rather than something your child carries around all day. The AAP recommends that children transition to an open cup by about age 2.
Protecting the Breastfeeding Relationship
One of the biggest concerns breastfeeding parents have is whether introducing a cup will lead to early weaning or nipple confusion. Cup feeding actually carries less risk of nipple confusion than bottles do. The World Health Organization considers cup feeding a safe alternative for breastfed babies precisely because it doesn’t involve the same sucking mechanics as a bottle or pacifier. Your baby uses a lapping or sipping motion with a cup, which is completely different from how they latch at the breast.
To keep your milk supply steady, offer the cup only at mealtimes alongside solid foods, not as a replacement for a nursing session. Your baby’s primary calories and hydration should still come from breast milk through at least the first year. The cup is a complementary skill, not a substitute. Most breastfed babies will naturally increase their cup use as they eat more solids and eventually wean at their own pace.
How to Offer the First Sips
Sit your baby upright on your lap or in a highchair. If you’re starting with a small open cup, fill it with just a tablespoon or two of water or breast milk. Bring the rim to your baby’s lower lip and tip it gently so the liquid just touches their lips. Don’t pour it in. Let your baby set the pace, lapping or sipping on their own. If they cough or sputter, lean them slightly forward and pause.
For a straw cup, you may need to demonstrate by placing the straw in liquid, covering the top with your finger to trap a small amount, then releasing it into your baby’s mouth so they learn what happens when they suck on the straw. Some babies figure this out in a day, others take weeks. There’s no rush.
Keep cup practice limited to mealtimes, and cap each session at about 30 minutes so it stays relaxed. Expect mess. Expect refusal some days. Your baby is learning a motor skill on top of everything else happening at 6 months, and patience matters more than technique.
Protecting Your Baby’s Teeth
Once your baby has teeth coming in, what goes in the cup matters as much as the cup itself. Fluoridated water is the best choice for dental health between meals. Milk is fine during mealtimes because chewing food alongside it stimulates saliva, which helps wash sugar off teeth. Never let your baby go to bed with a cup containing anything other than water. Letting milk or any sweetened liquid pool around the teeth overnight is one of the fastest paths to early childhood cavities.
Using a cup at meals rather than carrying one around all day also helps. Constant sipping on anything besides water bathes the teeth in sugar repeatedly, and even breast milk contains natural sugars that can contribute to decay with prolonged contact.