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Original poster

What’s the adult equivalent size for a 12-13 year old?

38 replies

Booksandflowers · 22/04/2024 14:04

Looking at buying some period knickers for my 12 year old in anticipation of starting but no idea what size to get. Would get size 12-13 if available but they come in adult sizes.

I can’t measure her or her current undies at the moment. What’s an average 12 year old? A 6 maybe? Or an 8?

OP posts:
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mitogoshi · 22/04/2024 19:08

6-8 typically but possibly larger, they tend to have waist sizes on the website

SparkyBlue · 22/04/2024 18:53

I bought a modibodi swimsuit for 11 year old DD and she absolutely loves it. I bought it in January when I was a bit broke and I did initially roll my eyes at the amount it cost as her school swimming lessons started at the end of January but it was well worth the money. She felt very comfortable and confident in it. It also has extra coverage in the boob area so great for those who are developing larger breasts and are feeling self conscious.

Disasterclass · 22/04/2024 17:31

I just had the same issue - buying 13 year old DD her first period pants. I went for a size 6, and they fit ok

Original poster
Booksandflowers · 22/04/2024 17:21

timetorefresh · 22/04/2024 17:16

Modibodi swimwear is great, but pricey

It is. Next doesn’t have swimwear for teens at the moment so that’s annoying too.

OP posts:
timetorefresh · 22/04/2024 17:16

Modibodi swimwear is great, but pricey

Blaggingit123 · 22/04/2024 17:13

My 11yo has cheeky ones in a 4-6 and typically wears 12-13 or 13-14 in clothes. However generally in adult clothes sizes can be anything from a 4 to a 10 - there’s a lot of variability! I’d expect M&S to be quite generous.

Original poster
Booksandflowers · 22/04/2024 17:01

Lovehearts82 · 22/04/2024 15:20

Next have period pants in teen sizes that go upto age 16 and womens adult sizes, also they have some period swimwear.

ah thanks. Next might be easier than trawling through the numerous other sites.

OP posts:
IbizaToTheNorfolkBroads · 22/04/2024 15:53

Modibodi do a teen range

SkaterGrrrrl · 22/04/2024 15:23

I feel your pain! My DD is 13 and in some shops she's age 13-14, in others I have to guess her adult size. I'm a size 10 and she's smaller than me so I go for size 8.

Ambergrease · 22/04/2024 15:23

Modibodi have a measuring guide - they come up very small, I was surprised to find skinny 12yo dd needed their teen 14-16 size, or their 8 in women’s sizes. I ordered from them as they do swimming costumes, too.

LordGribeau · 22/04/2024 15:23

My 11 yo wears M&S size 8-10. She's very tall and developed for her age though (usually in 14-15 size kids clothes), so it will depend on the size of the individual.

CompletelyDifferentGoldSpangles · 22/04/2024 15:22

Remember that M&S's idea of a size six is absolutely huge if you're shopping there.

Comedycook · 22/04/2024 15:22

I bought my dd period bikini bottoms from Primark last year...In a size 6

DragonFly98 · 22/04/2024 15:22

A size 4 maybe a 6 is sized big.

Lovehearts82 · 22/04/2024 15:20

Next have period pants in teen sizes that go upto age 16 and womens adult sizes, also they have some period swimwear.

Comedycook · 22/04/2024 15:19

My dd is an average sized 13 year old and would wear a 6-8 or xs.

When she was 12, I'd have said more of a size 4 or xxs

GoFaster83 · 22/04/2024 15:17

(Although I am grateful that I am of the generation after those awful belts)

GoFaster83 · 22/04/2024 15:16

Nothing to add except I'm a 8-10 and can fit aged 12-13 underwear. (I will not tell you how I know this, but rest assured it was a necessity and I couldn't make eye contact for several days). But I'm so jealous of the wealth of products available. When I was a teen there was the bulky pads, the tell-tale rustling in the cubicle which was so embarrassing at 13. For once, practical solution for a women's issue. Great stuff.

TenThousandSpoons · 22/04/2024 14:52

4-6 or XS.

modibodi does period swimwear which works well.

They also do period pants in teen sizes as well as adult sizes.

Original poster
Booksandflowers · 22/04/2024 14:50

My god. Looking at all the places to buy them and it’s a minefield.

OP posts:
TooMinty · 22/04/2024 14:38

I have the Primark period knickers in XS, which fit fine and allow for bloating.

TooMinty · 22/04/2024 14:36

So from the other perspective...
I'm an adult but I often wear children's clothes as I'm a short arse. I wear 6 or occasionally 4 in adult clothes and age 11-12 in kids 😂

Desperatelyneedabreak · 22/04/2024 14:26

Depends on the child my daughter is an 8/10 age 13

Original poster
Booksandflowers · 22/04/2024 14:24

givemushypeasachance · 22/04/2024 14:19

Seem to be called period swimwear but don't think M&S sell those.

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Ah thanks. That’s why I can’t find any then! 🤣

OP posts:
OneRingToRuleThemAll · 22/04/2024 14:22

My 13yo wears 12 in children's clothes and 6 petite in adult clothes.

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