When to Introduce a Cup to Baby? | The 6-Month Milestone

For the full breakdown, see our best Cup for 9 Month Old guide.

The moment your child starts eating solids—usually at the half-year mark—is the same moment you can start offering sips from an open cup or a free-flow cup without a valve. You don’t need to wait until they’re walking, talking, or done with bottles. The transition is tied to developmental readiness and the start of solid foods, not a birthday. Expect spills and wet shirts; that mess is the sound of progress.

Why 6 Months Is the Sweet Spot

Major health organizations agree. The CDC notes that the American Academy of Pediatrics (AAP) recommends offering a cup once a child starts eating solid foods, typically around 6 months. The AAP’s HealthyChildren resource says the same: begin offering a cup as early as 6 months, ideally when solids begin. The UK’s NHS similarly advises introducing a cup or beaker from around 6 months, with small sips of water at mealtimes.

The reasoning is practical. At this age, most babies can sit with support, hold objects with both hands, and bring things to their mouths—the foundation for cup use. A baby who isn’t sitting upright yet or shows no interest in holding objects may simply need more time; there’s no harm in waiting a few extra weeks. Under 6 months, the NHS says water should be boiled and cooled first, and it shouldn’t replace milk feeds. The cup transition is genuinely tied to solids.

Open Cup or Free-Flow Cup—and What to Avoid

Choose the right vessel and learning comes faster. The NHS specifically recommends an open cup or a free-flow cup without a valve because both help a baby learn to sip properly and are better for developing teeth. A free-flow cup lets liquid flow when tipped, requiring no suction. Valve cups and non-spill cups demand sucking or biting, training the wrong muscle pattern. Bottle-style feeders or teat-style cups delay the skill you’re building. If your baby can handle a bit of liquid at a time, a small open cup held by you—or by two little hands with your help—is the fastest path to independent sipping.

• Open cup: best for learning to sip; expect spills at first.
• Free-flow cup without a valve: a practical middle ground that still teaches sipping.
• Valve or non-spill cups: not recommended; they encourage sucking instead of sipping.
• Bottle-style or teat cups: skip these; they delay the transition.

How to Start: Small Sips, Mealtime Only

Start with small amounts. The NHS suggests offering sips of water alongside meals, not large quantities between them. A few teaspoons in a cup is plenty at the beginning. At 6 months, water complements milk feeds, not replaces them. If you’re not using bottles at all, the AAP notes a cup can be filled with breast milk around this age. Follow this sequence:

1. Hold your baby upright in your lap, supported at the head, neck, and body.
2. Touch the cup rim gently to the lower lip.
3. Tilt the cup just enough that the liquid reaches the lips.
4. Let your baby sip at their own pace. Never pour milk or water into the mouth.

This positioning mirrors the CDC’s emergency cup-feeding guidance, adapted for everyday practice: the baby controls the flow, not the adult. When the cup is empty and the meal is done, you’re done. Two or three mealtime sips a day is a solid start. As coordination improves, you can offer more.

Common Mistakes That Slow the Transition

Most cup-introduction struggles trace back to a few predictable errors: reaching for a bottle-style or teat feeder out of convenience, using a valve cup that requires suction, offering big servings of water instead of small mealtime sips (which fills little bellies and reduces milk intake), and leaving a baby unsupervised while drinking. By 12 months, NHS-linked guidance says bottles should be actively discouraged. The cup isn’t a someday skill; the window between 6 and 12 months is when it sticks best.