Open Cup vs Straw Cup vs Sippy Cup: Which Is Right for Your Baby?

Open cup, straw cup, sippy cup, 360 cup — why are there so many choices for one small drink of water?

For many parents, the decision arrives just as their baby starts solids. Product labels can make it sound as though there is one developmentally perfect cup and every other option is a mistake. Real family life is less tidy: the cup that works at the highchair may not be the one you want in the pram or childcare bag.

You do not need to find one cup that solves every situation. A small open cup can build a useful everyday skill, a straw cup can be practical away from home, and a sippy or 360 cup may still help with transition or spill control.

This guide compares the main cup styles without turning any one of them into a hero or a villain.

Key Takeaways

• When can cup practice begin? From around six months, when your baby is starting solids and can sit upright with support.
• Which cup is best? Open and straw cups build useful long-term skills, but one cup does not need to suit every situation.
• Does my baby need a sippy cup? No. It can be a practical transition tool, but it is not a compulsory developmental stage.
• What matters when buying? Choose a cup your child can manage and that you can fully take apart, clean and dry.

Which cup should you choose for your baby?

For many families, a small open cup for supervised mealtimes and a straw or trainer cup for outings is a practical combination. This gives your baby regular open-cup practice without expecting an uncovered cup to work everywhere.

If your child already uses a sippy or 360 cup, there is no need to throw it away. Offer an open cup or straw cup alongside it and let the skills develop gradually. Babies learn in different orders, and convenience still matters.

When can babies start drinking from a cup?

Most babies can begin practising from around six months, when they are also starting solid foods. The Raising Children Network recommends starting with a small, non-breakable cup that is easy to grip, adding only a small amount of liquid and helping your baby tip it gently.

At this stage, the cup is mainly for learning. Breastmilk or infant formula should continue while complementary foods are introduced. Australia’s Infant Feeding Guidelines advise that other drinks, apart from cooled boiled tap water, should be avoided until 12 months.

Sit your baby upright and stay close. Begin with a small amount so the flow is easier to manage and a spill does not become a full highchair flood.

Open cup vs straw cup vs sippy cup: at a glance

There is no universal winner. The most useful comparison is what each design does well, what it asks your child to learn and what it asks you to clean.

What is an open cup?

An open cup has no lid, straw or spout. For a baby, choose one that is small, lightweight, non-breakable and easy to grip. Add only enough liquid for one or two sips.

An open cup lets your baby practise bringing the cup to their mouth, controlling the tilt and responding to an unrestricted flow. It is also the easiest design to inspect and clean because there are no hidden valves or tubes.

Advantages of an open cup

• It builds a skill your child can keep using.
• There are no hidden parts to wash.
• You can see the entire drinking surface.
• A small cup can help your child join family mealtimes.

Limitations of an open cup

• Spills are normal while your baby learns.
• Young babies need close adult help.
• It is not practical in every pram, car or childcare setting.
• A large cup can deliver liquid too quickly.

Hello Charlie’s verified We Might Be Tiny collection includes small silicone grip cups made for children moving towards an open cup.

What is a straw cup?

A straw cup uses a reusable straw rather than an open rim or projecting spout. Many families use one alongside an open cup because it combines portability with a drinking method that remains useful as children grow.

Advantages of a straw cup

• It is usually easier to take outside the home.
• Some babies find sucking through a straw easier than controlling a cup tilt.
• A secure lid can reduce spills.
• The skill remains useful beyond the transition stage.

Limitations of a straw cup

• Some babies need time to understand how a straw works.
• Spill-proof valves can make suction harder.
• Narrow straws, weights and seals require detailed cleaning.
• Milk and smoothie residue can hide inside the straw.

The verified Re-Play Straw Cup with Reusable Straw is one example of a simple reusable straw design available at Hello Charlie.

What is a sippy cup?

A traditional sippy cup has a lid with a projecting spout. The spout may be soft or hard, free-flowing or fitted with a valve to reduce leaking.

The American Academy of Pediatrics describes the sippy cup as an optional step rather than a compulsory stage. Its bottle-to-cup guidance notes that a valve makes a child suck to release liquid; where practical, it suggests a simple design without a valve.

Advantages of a sippy cup

• It can feel familiar during a bottle transition.
• Handles and soft spouts work well for some babies.
• Leak-resistant designs are convenient in bags and prams.
• It can provide a short-term step while other skills develop.

Limitations of a sippy cup

• Some designs require bottle-like suction rather than free flow.
• Spouts, collars and valves can hold residue.
• Your child will eventually need practice with a regular cup.
• Carrying milk or sweet drinks for frequent sipping is not a healthy use pattern.

The verified Haakaa Silicone Sip-N-Snack Cup is a flexible example that can use interchangeable lids or become an open cup.

What is a 360 cup?

A 360 cup covers the top of the cup but releases liquid when your child presses or sucks at the rim. It has no projecting spout and can reduce spills, although the release action is not the same as drinking from an uncovered rim.

You do not need to feel anxious if a 360 cup works for your child. Treat it as another practical tool and continue offering occasional open-cup practice if you want your child to learn both actions.

Are sippy cups bad for babies?

No cup label tells the whole story. A sippy cup can be a convenient transition tool, and using one does not mean you have harmed your child.

Strong online claims sometimes turn cup choice into a verdict on speech, teeth or feeding development. A more useful approach is to consider the whole pattern: what is in the cup, how often your child sips, whether they also practise other drinking skills and whether the cup can be cleaned properly.

If you already own sippy cups, use them where they help and add an open or straw cup at meals. Children can learn more than one drinking method at the same time.

A practical cup guide for real family life

How to teach your baby cup skills

How to teach your baby to use an open cup

1. Choose a small, lightweight, non-breakable cup.
2. Add only enough water for one or two sips.
3. Sit your baby upright and remain beside them.
4. Hold the cup with both hands and bring it gently to the lower lip.
5. Tilt only until the water touches the lips.
6. Let your baby close their lips and take a small sip.
7. Lower the cup before too much liquid enters the mouth.
8. Repeat without pressure.

Most of the first cup may land on the bib or tray. That is normal. The goal is practice, not finishing a serving.

How to teach your baby to use a straw cup

• Let your baby watch you drink through a straw.
• Try a short, soft straw that is easy to reach.
• Use only a small amount of liquid.
• Consider a free-flow straw before a strong spill-proof valve.
• Offer the cup regularly without forcing it.
• If your baby becomes frustrated, pause and try again another day.

Materials, drinks and cleaning

What should go in your baby’s cup?

For babies aged 6–12 months, Raising Children Network recommends only cooled boiled tap water, breastmilk or infant formula. After 12 months, full-fat cow’s milk can be offered as a drink for most healthy children, alongside water and continued breastfeeding if desired.

Sweet drinks, juice, cordial, soft drink and flavoured milk are not recommended for babies and young children. The Australian Dental Association explains that frequent sugary drinks can contribute to tooth decay and erosion; plain water is the simplest everyday choice.

Silicone, stainless steel or plastic?

Silicone is soft, quiet when dropped and often easy for small hands to grip. Confirm the product’s dishwasher and sterilising instructions.

Stainless steel is durable and suited to long-term use. It can be heavier and it is not microwave-safe.

Plastic and recycled plastic are lightweight and convenient for travel. Look for clear material information, durable construction and available replacement parts.

Material matters, but design, durability and cleaning access matter too. A simple cup that fully comes apart can be a better everyday choice than a complicated cup made from a fashionable material.

How to clean cups and straws

1. Take apart every removable component after use.
2. Rinse away visible milk or food residue promptly.
3. Wash according to the manufacturer’s instructions.
4. Use the correct-size brush for narrow straws and channels.
5. Dry every part separately before reassembly.
6. Inspect valves, seals and straws for residue, odour, damage or mould.

What most baby cup guides miss

The best cup is often a small system, not a single product. A simple open cup can live at the highchair while a secure straw cup goes to childcare. Expecting one design to be perfect at home, in the car, in a bag and during independent play creates a problem no cup can solve.

“Spill-proof” usually means a trade-off. More spill control can mean more valves, seals, suction and cleaning work. That does not make the cup bad; it means convenience has a maintenance cost.

Materials do not rescue a poor design. Stainless steel, silicone or recycled plastic can all be reasonable choices, but only if the cup suits your child and you can reach every food-contact surface.

Finally, children can learn more than one drinking action. You do not need to delay one cup until another is mastered.

Choose your baby’s cup with purpose

For many families, one small open cup and one practical portable cup are enough. Before buying another design, ask what problem it needs to solve.

Hello Charlie’s live Feeding Bottles & Cups collection brings together open, straw and trainer options in silicone, stainless steel, glass and recycled plastic.

Explore feeding bottles and cups

Frequently asked questions

Should I introduce an open cup or straw cup first?

Either order can work. Many families offer a small open cup at supervised meals and introduce a straw cup around the same time for portability. Start with the design your baby can explore calmly and keep offering both without pressure.

Does my baby need a sippy cup?

No. A sippy cup is optional. Some babies move from breast or bottle directly to an open or straw cup; others find a spouted trainer useful for a short period. It is a tool, not a required milestone.

Can a six-month-old use an open cup?

Yes, many babies can begin supported practice from around six months. Use a small, non-breakable cup, add very little liquid, sit your baby upright and control the tilt. Spilling is expected.

Is a straw cup better than a sippy cup?

A straw cup is often useful for longer-term portability, but “better” depends on the child and situation. Compare suction effort, spill control, cleaning access and how long you expect to use the cup.

Should I throw away our existing sippy cups?

No. If the cups are in sound condition and can be cleaned properly, keep using them where they are practical. Add open- or straw-cup opportunities so your child develops more than one drinking skill.

How much water should I put in the first cup?

Begin with only enough for one or two small sips. The small volume makes the flow easier to control and keeps spills manageable. Cup practice at six months is about learning, not drinking a full cup.

Related Reading

• Plastic Free July: Simple Swaps for a Healthier Start
• Why Non-Toxic Baby Products Matter for Babies and Kids
• Baby Bottle Teats: What’s the Difference Between Latex and Silicone?

Sources and fact-check notes

• How to Teach Babies to Drink From a Cup — Raising Children Network.
• Infant Feeding Guidelines — National Health and Medical Research Council.
• Introducing Solid Food — Pregnancy, Birth and Baby.
• From Bottle to Cup: Helping Your Child Make a Healthy Transition — HealthyChildren.org, American Academy of Pediatrics.
• Food and Drinks for Children — Australian Dental Association.