The short answer: a 1-year-old is working on four things — picking up small objects (the pincer grip), making things happen (cause and effect), first words, and getting upright. The best toys for a 1-year-old are the ones that give a lot of practice at one of those without needing an adult to run them. Below are six we'd choose, from $14.99 to $39.99, with the age each one is good until.
A quick honest note first: "1-year-old" covers a huge range. A just-turned-one may still be crawling; a nearly-two is running and saying twenty words. So each pick below says which end of the year it suits.
What the milestones actually say
The American Academy of Pediatrics' twelve-month milestones for hand and finger skills read like a toy brief: "uses pincer grasp, bangs two cubes together, puts objects into container, takes objects out of container, lets objects go voluntarily, pokes with index finger." Every toy below gives one of those a workout. That's the whole method.
1. Something to match — for the hands

$24.99
Ages 1–4Twelve wooden eggs that only close when the shape inside matches. At twelve months it's a set of eggs to open and bang together; by eighteen months they've worked out the matching; by two they do all twelve in a row.
See the eggs2. Something to stack and knock down — for cause and effect

$24.99
Ages 1–4Five columns of graded pegs with chunky rings and shapes. The one-year-old version of this toy is: put the ring on, take the ring off, tip the whole thing over. That's cause and effect, and it's the whole job at this age.
See the sorting board3. Something to hide and find — for object permanence

$34.99
Ages 1–4A plush hive with bees that tuck into the cells and pull out again. Around one, children are fascinated by things that disappear and come back — it's why peekaboo works — and this is peekaboo they can run themselves.
See the beehive4. Something that does three jobs — the big present

$39.99
Ages 1–4Shape sorter, abacus and spinner in one rocket. At one the spinner is the whole toy; at eighteen months the sorter takes over; at three they're sliding the abacus beads and counting.
See the rocket5. Something to pretend with — for the words

$29.99
Ages 1–4A fabric farm that folds flat, with animals to post through the doors. At one the point is the animals: you name them, they point, eventually they say "moo". Goes in the car.
See the barn6. Something for the ones who aren't walking yet

$14.99
3–18 monthsA cloth jungle book with crinkle panels and ribbon tags, for the sitting-and-chewing end of the first year. The first book a baby handles themselves, and it's washable, which it will need to be.
See the bookThe Pop-Up Beach Tent with Pool ($35.99) works from about six months, once they can sit — a UPF 50+ tent with a shallow paddling pool in the floor. It's our most-bought product and most of it gets used on the back lawn, not the beach.
What to skip at one
Anything that needs them to follow instructions, anything with a screen, and anything with small parts — everything still goes in the mouth. Skip "3-in-1 activity centres" with twelve buttons that all play a different tune; a one-year-old wants one thing that does one clear thing when they act on it.
Questions parents ask
What's the best toy for a 1-year-old's development?
Whichever one they'll use repeatedly. Repetition is the mechanism: the pincer grip, cause and effect and object permanence are all learned by doing the same small thing several hundred times, and a toy that gets used every day for ten minutes does more than an elaborate one used twice. A $25 set of matching eggs beats a $200 activity table on that measure. The second test is whether the child can operate it alone — if it needs an adult, it gets used only when an adult is free.
Are wooden toys safe for a 1-year-old?
Yes, as long as the pieces are too big to swallow and the finish is non-toxic — both true of everything above. The AAP's rule of thumb is "think large": every part bigger than the child's mouth. Wooden toys also survive being thrown, which a one-year-old will test on the first day, and they don't have batteries, which means nothing to leak or lose. The one caution is splinters on cheap unfinished wood — run a thumb over the edges when it arrives.
How many toys should a 1-year-old have out?
Three or four. Rotate the rest weekly. A one-year-old with thirty toys out plays with none of them properly — they crawl from one to the next and settle on nothing. Put most of the toys in a box in a cupboard and swap a few in each weekend; the returning toys get played with like new, and the room stays walkable.
What's a good first birthday present?
The Personalised Name Puzzle ($39.99) — their name in lift-out wooden letters with a free message engraved on the back. At one it's something to pull apart; at four it's the first word they read. It's the present that gets kept, and the engraving is what makes it theirs. It's cut to order, so allow a couple of weeks.
See the full range on our Gifts for 1 Year Olds collection, or for the older end, Toys for 2 Year Olds.
Source: American Academy of Pediatrics, Developmental Milestones: 12 Months, HealthyChildren.org. Prices in USD, correct at time of writing.
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