Best Inflatable Dinosaur Costumes for Kids: The T-Rex That Fills Out in Under a Minute

The best inflatable dinosaur costume for kids is our Kids Inflatable T-Rex Dinosaur Costume: your child steps in, switches on the built-in fan, and is a full-blown stomping T-rex in under a minute, for £30.99 with the fan and battery pack included in the box. The fan runs on four AA batteries (not included, so add a pack to the order) and keeps the shape up for roughly four hours, which outlasts most parties. We check more than 30 measurements on every design we make, so the one-size kids fit is built around real children rather than a hopeful guess.

T-rex is the headline act, but it is not the only dinosaur in our kids inflatable costumes range, and the right pick depends on the child wearing it. Below we compare all four inflatable dinosaurs we make, plus two no-fan alternatives for younger kids and battery-free days. This post is part of our kids Halloween series, so if you are still choosing a theme, start with our guide to the best kids Halloween costumes; and if the household debate is dinosaurs versus aliens, we have ranked the best inflatable alien costumes for kids too.

• Every kids dinosaur costume we make, compared
• Which inflatable dinosaur fancy dress costume suits your child?
• Two dinosaur costumes with no fan at all
• Batteries, visibility and the stomp test
• Frequently asked questions

Every kids dinosaur costume we make, compared

Six real costumes, four with a fan and two without. Prices are what they cost today on our UK store, and every inflatable in the table runs on four AA batteries that are not included, so budget one pack per dinosaur.

Which inflatable dinosaur fancy dress costume suits your child?

Nearly one third of young children develop an extremely intense interest in one subject, according to a study of 177 parents published in Developmental Psychology, and any parent of a dinosaur expert knows exactly which subject we mean. So we have matched each of the four inflatables to the kind of dinosaur kid you actually have.

The classic stomper: Kids Inflatable T-Rex Dinosaur Costume

This is the inflatable T-rex look that took the internet by storm, sized for kids and £30.99 with the fan and battery pack already in the box. The soft, stretchy fabric fills out into a proper big-headed, tiny-armed T-rex silhouette that reads across a playground in one glance, and because air holds the shape rather than padding, it is light enough to wear through a whole party. It is safety test approved, like everything we make for children. If your child has been requesting a dinosaur since breakfast every day this year, this is the one.

The Halloween twist: Kids Giant T-Rex Skeleton Inflatable Costume

Same stomp, spookier bones. The skeleton version is £35.99 and swaps the green skin for a printed skeleton design with a Halloween and Day of the Dead feel, which makes it the dinosaur that also earns its keep on the last night of October. It is huge, the white-bones-on-black print stands out in a dim room the way plain green never will, and it means the dinosaur obsession and the trick-or-treat outfit are settled in one go. One costume, two occasions is the honest maths on this one.

The double-take: Kids Ride On T-Rex Skeleton Inflatable Costume

The ride-on does the trick every inflatable secretly promises: it looks like your child is riding an undead T-rex around the party. Their real legs do the walking while the costume supplies the dinosaur body and a pair of fake rider legs, and the whole illusion inflates in well under a minute. At £35.99 it is the pick for the child who wants laughs as much as roars, because nobody walks past a six-year-old on skeleton dino-back without a second look and a photo.

The gentle giant: Kids Diplodocus Giant Inflatable Costume

Not every dinosaur kid is a T-rex kid. The Diplodocus is £40.99, carries that unmistakable long neck high above the crowd, and quietly solves an engineering problem: your child has two legs and a diplodocus had four, which the costume covers through the magic of air inflation and a bit of design cheek. This is the pick for the child who tells you, mid-bedtime, that a diplodocus was longer than two buses. They will spot instantly that we gave it the right neck.

Two dinosaur costumes with no fan at all

Some days call for a dinosaur without batteries: younger children, long school days, or a party where a big inflatable is more dinosaur than the room can take.

The Kids T-Rex Piggyback Costume (£30.99) makes it look like a friendly T-rex is carrying your child on its back, and the setup is gloriously low-tech: stuff the dinosaur's legs with rolled-up newspaper and the illusion is ready, nothing to switch on and nothing to run flat.

The Kid's Green T-rex Dinosaur Costume (£25.99) is our simplest entry, an all-in-one onesie and hood in soft, comfortable fabric that a child can wear from the school gate to the sofa; it also comes in an orange version for kids who take their dinosaur colour opinions seriously. You can browse every no-fan option in our kids dinosaur costumes range.

Batteries, visibility and the stomp test

Three practical things decide whether a fancy dress dinosaur is still being worn at the end of the party, and none of them is the print.

Batteries. Each inflatable runs its fan on four AA batteries, which are not included and last roughly four hours on a fresh set. The fan runs the whole time the costume is worn, so for a long day out, pack a spare four; swapping them takes under a minute and the dinosaur stands straight back up. Our full guide on how to put on an inflatable costume walks through the setup step by step.

Seeing out and staying cool. Every inflatable costume we make has an open face, so your child can see where they are stomping, talk to their friends and eat their own party food. The fan doing the inflating is also moving fresh air around them the whole time, which is why kids keep these costumes on for hours rather than shedding them at the door.

The stomp test. A real Tyrannosaurus rex preferred to walk at about 4.6 kilometres per hour according to a biomechanical study in Royal Society Open Science, which is roughly the pace of a human out for a stroll. That means a five-year-old at full charge is officially faster than the real thing, and the costume is built for exactly that: soft, stretchy fabric, more than 30 measurements checked on every design, and 500,000+ quality checks a year across everything we ship. That is the Morph Promise doing its job: no unwanted surprises, and a dinosaur that looks like the one on the page.

Frequently asked questions

We make your best times better with costumes.