A warm, evidence-led guide to choosing toys that nurture two developing minds at once, without doubling every expense.
At eighteen months, twins are in one of the most fascinating and briefly overlooked windows of early childhood. Each child is simultaneously navigating a burst of language, a growing sense of independent will, and the particular social complexity of always having a peer right beside them. The single most useful thing parents of eighteen-month-old twins can do when choosing toys is to prioritise open-ended, durable objects that reward solo exploration just as readily as they invite a second child to join in. Wooden stacking, sorting and building toys sit at the top of that list, and a small, considered collection will serve both children far better than a larger array of single-purpose plastic novelties.
In practical terms, you do not need two of everything, but there are specific categories where a duplicate pays for itself in household peace within the first week. Stacking cups, simple shape sorters and sets of wooden blocks are the clearest examples. For everything else, a single generous set, thoughtfully chosen for its open-ended quality, gives both children enough material to play in parallel, to negotiate, and eventually to build something together. The sections below explain why, drawing on developmental research and a few well-chosen products from Jaques of London, a maker of quality wooden toys since 1795.
What the research says about play at 18 months
Developmental psychologist Alison Gopnik describes toddlers of this age as engaged in active hypothesis-testing, using objects to discover cause and effect. The work of Hirsh-Pasek and Golinkoff on playful learning consistently shows that the richest cognitive gains come from play that is self-directed, process-focused and socially embedded. Open-ended wooden toys meet all three criteria simultaneously.
Eighteen months marks a developmental crossroads. Most children at this age are walking confidently, beginning to use single words or short phrases, and showing the first clear signs of a theory of mind: the dawning understanding that another person has desires and intentions of their own. For twins, that last development has an unusually early workout, because the other person is always present, always competing for the same caregiver attention, and often reaching for the same object at the same moment.
Researcher Jeffrey Trawick-Smith has documented how the physical properties of toys shape the quality of play children are able to achieve. Toys that can be manipulated in multiple ways, stacked, sorted, filled, emptied, lined up and knocked down, tend to sustain engagement longer and invite richer peer interaction than toys with a single prescribed function. For twins, this matters doubly: a toy that only does one thing creates a single point of conflict, whereas a toy that does many things creates many simultaneous opportunities.
Jean Piaget observed that children under two typically engage in parallel play, working alongside one another rather than with one another, and that this is not a social deficit but a necessary stage of development. Twins tend to move through this transition with slightly more social experience than singletons of the same age, simply by virtue of constant proximity, but the parallel play phase is still very much present at eighteen months and deserves to be honoured rather than hurried.
The practical implication is that the best toy environment for eighteen-month-old twins provides enough material for each child to pursue their own investigation, while keeping the objects similar enough that shared exploration can emerge naturally. A single large set of wooden blocks achieves exactly this. Both children can build their own towers without negotiating, and when one tower falls into the other, that becomes the starting point for something new rather than a cause for distress.
The sensory case for wood is straightforward and often underestimated. Wooden objects have genuine weight, texture and temperature variation. They make a satisfying sound when stacked or tapped together. These properties give an eighteen-month-old's developing proprioceptive system real feedback, feedback that lightweight plastic simply cannot replicate. Patricia Kuhl and her colleagues have emphasised how multisensory input accelerates early learning; a toy that engages touch, hearing and vision simultaneously is doing considerably more developmental work than one that engages vision alone.
For fine motor development specifically, wooden shapes with grasping edges, pegs, knobs and interlocking forms give small hands purposeful work. The TIMPANI study, which examined the relationship between toy characteristics and the quality of parent-child verbal interaction, found that simpler, open-ended toys generated significantly more language from both caregivers and children than electronic toys with built-in sounds and lights. For twins who are both in a critical language-acquisition window, that finding is particularly relevant.
Explore Jaques wooden toys: open-ended, beautifully made and designed to last across the early yearsThe honest answer is: two of some things, one generous set of others. The categories where a duplicate almost always earns its keep are those where the toy is small, highly desirable and impossible to share without physical contact: stacking rings, shape sorters and small push-along vehicles. For these, a second copy removes a reliable source of conflict without requiring any negotiation skills that eighteen-month-olds simply do not yet possess.
For everything else, a single large, well-made set rewards both children more richly than two smaller sets. A substantial collection of wooden blocks gives both children more building material than two modest sets would, and creates the conditions for genuine collaborative building as they grow. The same logic applies to simple puzzles, where a single floor puzzle with generous, chunky pieces invites both children to place pieces without requiring them to take turns on a single object.
A note on conflict and development
The American Academy of Pediatrics reminds parents that conflict over objects is entirely normal and developmentally appropriate at this age. It is the beginning of negotiation, not a sign of poor socialisation. Providing some duplicates reduces unnecessary friction, but allowing children to experience and resolve minor disputes is itself valuable social learning, provided an adult is nearby to support rather than always to intervene.
Adele Diamond's research on executive function in early childhood identifies inhibitory control and cognitive flexibility as the two capacities that most reliably predict later academic and social success. Stacking and sorting toys exercise both. A child who places a block carefully, notices it is wobbling and adjusts before adding the next one is practising inhibitory control in its most tangible form. A child who empties a shape sorter and begins again with a different approach is demonstrating cognitive flexibility.
For twins, these toys have the additional advantage of generating what Lev Vygotsky called the zone of proximal development between peers: situations where one child is slightly ahead of the other on a particular task and naturally models the solution, pulling both children forward.
Browse Jaques educational toys: thoughtfully designed to build the skills that matter most in the early yearsFormal turn-taking games are generally suited to children from age three upwards, but the foundations of turn-taking can and should begin much earlier. Simple skittles, a soft ball rolled between two children, or a basic stacking game where each player adds one piece at a time are entirely accessible at eighteen months with a relaxed adult facilitating rather than adjudicating. Jaques of London, as the world's oldest games company, has always understood that the purpose of a game at any age is the quality of the interaction it generates, not the competitiveness of its outcome.
When evaluating wooden toys for children of this age, look for smooth, splinter-free finishes, non-toxic water-based or natural oil paints, and piece sizes that cannot be swallowed. In the UK, the relevant standard is EN 71, the European toy safety specification that all reputable manufacturers will reference. Durability matters particularly for twins, because every toy will receive twice the handling. A well-made wooden toy that lasts three years and is then passed on represents considerably better value than a plastic equivalent that survives six months of shared use.
Entirely normal, and well documented. At eighteen months, children are strongly drawn to whatever another child is holding, because peer attention signals desirability. The American Academy of Pediatrics describes this as object-focused social referencing. Providing one duplicate of the most-contested toy, alongside a generous supply of open-ended materials that can be shared without physical contact, resolves the majority of these disputes without requiring negotiation skills that will not be reliably present until closer to age three.
Look for the CE or UKCA mark on the packaging, which confirms the toy has been assessed against EN 71. For children under three, pay particular attention to piece size: any component small enough to fit entirely inside a 35mm film canister is considered a choking hazard under UK and European standards. Reputable wooden toy makers will clearly state the age recommendation and the finish used. Natural oil finishes and water-based paints are the safest options; avoid any toy with a strong chemical smell or flaking paint.
The structured rules of most traditional games are indeed too advanced for this age, but the physical objects and social rituals that accompany them are not. Simple skittles, for instance, can be set up and knocked down long before a child understands scoring. The developmental benefit at this stage is not the game itself but the shared attention, the delight in a shared outcome, and the very first experience of waiting for one's turn. Keep the structure loose and the adult involvement warm and present, and traditional game equipment becomes some of the most valuable play material available.
The research strongly supports the fewer-and-better approach. A study by Dauch and colleagues found that toddlers in environments with fewer toys engaged in higher-quality, more sustained play than those surrounded by many toys. For twins on a budget, the most cost-effective strategy is to choose two or three well-made, open-ended wooden sets: perhaps one set of stacking or sorting toys that warrants a duplicate, and one large set of wooden blocks or similar building material. The long lifespan of a quality wooden toy, which can move with children through multiple developmental stages and then be stored for younger siblings or passed on, makes the initial investment significantly more economical over time.
Britain's oldest toy maker. Every toy open-ended, wooden, and built for exactly the kind of play the research recommends.