Big weight difference in twins

[Orange99]

I have boy/girl twins aged 9 and my boy is so thin compared to my girl. Does anyone has anything similar?

They both are healthy, eat and drink well. He is more active than she is, it still she has a few rolls on her tummy and I'm sure if she's getting breast buds or whether it's just 'puppy fat'?!

Obviously with being off school isn't helping because they are very active at school.

TIA

Girls and boys gain weight in different ways and that's why doctors have charts for girls and others for boys.
However if your DD looks a bit overweight to you, she probably is.

Puppy fat is a myth that excuses weight in children. There is no such thing as puppy fat. It is an expression that was coined to make parents less worried.

Puberty in girls is linked to body fat percentage, so if she is heavier, it might be breast buds you are seeing.
Could she be snacking without your knowledge? Do you find wrappers in her paper bin or under the bed?

You need to understand that physical activity plays almost zero role in weight management, so it is more likely that you need to look at what she really eats and drink during the day (and night).
If you have a snack/naughty drawer, maybe eliminate its content for a while

Yeah, people tend to forget that in a healthy 9 year old there should be no puppy fat, and in fact you should be able to see the ribs.

Thank you both.
My girl does like her food and will eat more than her brother.

I'm reluctant to take her to docs (if they'll see her at the moment) because I don't want her to start worrying about her weight, and potentially cause issues in her teens.

@Cormoran
I don't find wrappers, she's always asks for food and doesn't help herself.

She was thin, it's only been in the last year or so she has filled out.

Girls develop faster in puberty than boys

There is a BMI calculator on NHS website with healthy ranges for children of different ages. So could use that as a basis for thinking about whether either is outside a healthy weight.

The fact that they're twins isn't really relevant - boy girl twins are no more closely related than any other brother and sister, and I'm sure lots of families have children where one can eat lots and is like a rake whereas the other piles weight on quickly.

Thank you all.