What age/size was your kitten spayed?

[Coffeefirstthing]

Our new addition to the family is a ~5 month old kitten, we have had her for a month now.

She is a rescue and was born feral, and is quite a scrawny little thing.
Our vet only spays them when they weigh 2 kg. I was hoping she'd be big enough now but she was still only 1.7 kg when checked by the vet this week.
She has a big appetite and eats more than our older cat but just seems to put the weight on quite slowly. She was 1.5 kg when we got her.

So what age/weight were your cats spayed? Anything we can do to help her gain weight faster?
As she is so small the vet will only microchip her when she gets spayed and is under GA.

Attached a photo for reference. She may not be the prettiest of kittens but a true character and really lovable.

She is pretty. Love her one white paw.
Mine was neutered at 4 months 3 weeks, but he had grown quickly.

Thank you everyone for your input, it is much appreciated.

Thank you also for the compliments! I will tell her to ignore my silly OH when he calls her ugly! She is a goofy looking little thing but think it just makes her more adorable.

Ours were about 7 months and 2.5kg but we didn’t get them until 6 months and had to get them vaccinated first. They were groggy for a couple of days but fine after a week although it took a while for the fur to grow back.