Dd is gaining weight rapidly and I don’t know why

Same - I have just bought an age 14-15 jacket and it's roomy, I'm about a size 10

She does sound very heavy for her height.
It could be that she is growing out before she stretches upwards.
She could be a heavier build than the rest of the family too.

A friend of mine has a daughter who has always been overweight. Friend herself is very disciplined about her own weight but I've known her since she was at school and she herself was also on the chubbier side when she was at school.
She has limited her daughter's food, she has controlled all her calories, she has brought her to the gym. Its quite uncomfortable to watch and the daughter is still overweight. I expect that is how it is.
If your daughter is exercising, eating low fat food and her proportions are suitable and it sounds like this is the case, then just continue to watch it to make sure there isn't an underlying medical condition.

Yes, this

Op, on the food issue, I would change her diet a little bit. I don't think this is causing the weight problem but some things on it arguably should not be eaten every day.

2 pieces of toast and spread or bowl of porridge or very occasionally a croissant or hot cross bun for a change.- Porridge is good but toast is not ideal for everyday. What kind of spread is she having?

Packed lunch
Sandwich or wrap with ham or cheese.
yogurt
piece of fruit
cereal bar for snack at break and water.- what kind of bread is she having? White bread? Brown bread? Certain kinds of bread are better choices than others. Also much bread is Ultra Processed (read Chris van Tulleken's book about UPFs). Ham- red meat should not be eaten daily ideally. Cereal bar - as pps have said this can be sugary.

Dinner
Meat, all fresh like chicken breast or pork chops, veg, potato or rice or pasta, occasionally beans but rarely. - what kind of rice and pasta? These can be fine but it depends what type.. Pork chops - again, red meat is not ideal daily.

I have PCOS and I wonder if this might be an issue? Anyway, I would recommend a good variety of fresh vegetables, nuts, seeds, and cards should opt for stuff like rye or sourdough bread, brown rice and spelt pasta. Also fish like salmon, seabass, plaice, mackerel etc

Fruit - remember some is good but some types are more sugary than others. I would focus on dark berries like blackberries, blueberries and raspberries.

I dont know if it helps but I read an article some years ago that said many people, but especially children, struggle to differentiate between thirst and hunger. So I started drinking a glass of water (or offering same to the kids) when the "I'm still hungry" thing happened with the promise of something in half an hour if I/they were still hungry. Was rarely needed but I realised I needed to up our fluid intake, which also helped.

A) it's not good, is it. We all know that, don't be obtuse.

B) at her weight she's not plump, she's huge. Can't fit in clothes for a 15 year old!

The thing that jumped out at me is her age. At ten, she is probably starting to enter puberty and it is very common for girls to put on weight before having a growth spurt. It used to be called puppy fat, then we were told that it was simply fat. However, I think many girls do go through a puppy fat stage a few months before their adolescent growth spurt. Is she showing other signs of puberty? If not, I think she soon will. In the meantime, if you keep a discreet eye on the situation, you will be able to monitor whether or not her weight is becoming a real problem.

kids go out the way then up the way. She is still growing. I wouldn't be too worried about it.

Why weigh your other child and yourself who is underweight? Sounds very unhealthy behaviour. Be very careful of how this will have made your eldest feel

“I’m still hungry!”

That doesn’t sound heavy to me. I weighed more at that age, looking back i was only slightly overweight My mum put me on a diet which turned into an ED. Be careful.
I think your idea of normal might be slightly skewed based on your own physique.

1 slice of toast would really be enough for a child her age. 2 slices is an adult portion. Do you weigh out the porridge? Porridge still has fat in though does have soluble fibre. What bread is the toast? 1 slice of toast is enough for a child her age. 2 is slices is an adult portion I often only have 1 slice if in a rush to get out. Coassonts also have a lot of saturated fat. There’s a lot of sugar in cereal bars. Cereal is UPF anyway. If she’s putting on around her stomach that indicates she’s eating a lot of processed foods. Ham isn’t healthy there’s a lot of salt in it. I buy our meat from a butcher and milk which is delivered. Everything else I buy online anything that’s not a natural food sauce I check the nutritional value. You would be shocked how many foods are high in saturated fats. I do get them but they are occasional treats not in our daily diet.

All my kids (6) went through this from around 10 to 14 ish. They would all put on weight to the point I was starting to get concerned, as you are, and then they would suddenly shoot up at least 2 inches. Its like the body was storing the energy for the next growth spurt. Only two are now overweight, one is DD who has PCOS and really struggles to lose it and DS who admits he eats crap (at uni).

I hope your daughter has not been privy to any of the comparisons to yours and your other daughter’s weight. She is probably in the middle of a growth spurt.

We didn’t have scales at home as kids and we are all healthy sized adults.

You are brave posting it on mumsnet.
I'd check with GP and ideally get a blood test done to roll out thyroid issues ,etc

Well 5 ft 3 but close enough to 5ft 2 I would say.

My son is almost the exact same height and weight (145cm and 42kg) at just turned 8. For those asking he has a lot of hospital appts so gets weighed a few times a year. In his case he started gaining after a seizure aged 5, he's actually having some hormone and genetic tests because he's off the scale for his age. And actually probably bigger now because those measurements are from an appt 3 months ago. He's not 'fat' looking though. Hes just sort of square and solid looking, easily looks 11 and wears age 11-12 clothes. Also has size 4 feet. I'm 5foot4, his dad is 5foot9.

His day is cereal, porridge or seeded toast for breakfast, cereal bar for snack. Fruit. Cheese wrap. Yoghurt for lunch, standard dinner might be apag bol, all home made with supper of a glass of milk and sometimes a biscuit or half slice of toast as he takes melatonin for sleep and says it tastes funny so a snack washes it down. He's definitely not eating more than his pals and has a sweetie, or crisps or whatever once or twice a week.

He's also incredibly active, walks to and from school, after school sports and play club at school. The other nights swimming. Tennis, gymnastics all for an hour and at the weekend spends 2-3 hours a day on trampoline parks, softplay, parks, dog walks, bike rides. I'd say he's well above average physical activity wise.

Anyway I took don't know but if I get answers I'll pop back.

Haven't read the whole thread, but my daughter gained a lot at that age and was looking overweight, again mostly in her stomach.

Within the next 18 months her period started, her body shape changed (developed a waist, boobs, etc) and she evened out. She'll likely never be a skinny minny, but she's perfectly normal (and beautiful!).

It doesn't sound like you or she is doing anything 'wrong' diet wise (although you might want to loosen up a bit! I think an overly restrictive diet with no 'treats' can lead to a obsession with them when they do have free access to it later)

Yawn. Not reading that slop.
your weight doesn’t matter to this post so why tf does it matter.

no, I’m not projecting either. My illness is to do with self-control so doesn’t derive from body image etc.

And I am shorty, with hourglass figure and put it all over myself

so my daughter too, who is tall, long legged and slim, with massive back but boy, she puts it in the middle.

Many of us were plump kids and teens, then we became slim , then gained again. There is no immediate risk to a child. She is not 12 stone

This has just triggered a really vivid memory of my sister at the end of primary school absolutely refusing to wear a skirt or trousers any more. She had gained weight and suddenly couldn't stand the feeling of anything around her middle. I can see her wee primary 7 face in my head now and definitely see looking back how much the weight gain was related to puberty. My mum had to scramble around trying to buying her pinafores for a couple of years because she wouldn't wear anything else😅

I have a chubby 10 year old (boy) and I am not totally sure why. He does hours and hours of sport each week, he has a good appetite but nothing wild and he eats normal home made/standard food. We don't really do much eating out or takeaways or anything like that and I limit his sweets. His siblings are very very slim.

I'm hoping just to keep him active and educated about food and nutrition and wait for him to grow up the way...

Great Ormond Street call it 'obesity'